Straight 8 work Report before I arrived was that the paper tape text punch program was no longer running. It was unclear if it needed to be reloaded or machine had more problems. Found memory was not operating properly. 2 diodes replaced fixing one memory issue and hopefully fixing another. Failure of accumulator card late in workshop prevented verification of memory fix. Machine not useable until I fix and return the accumulator card. Hopefully I can fix at home and send it back with someone at the System Source event next month. TLDR version: Initial testing showed the Computer would not reliably read or write memory. Checking signals on memory state card MD16 the flip flops were not always set back to idle state at the end of the memory cycle. Traced to the end of cycle signal from delay line in MC/MD18 not always present. The signal amplitude was gettting reduced as it went down the delay line taps. By the time it got to CP output it was marginal on triggering the output gate. With testing and swapping with card in MC/MD17 it did not look like the delay line card was the issue. Looking further the input pulse to the delay line was only 25 ns wide coming from W607 in MC19. This seemed short for the PDP logic. Checking the W607 datasheet its output should be a 70ns pulse. The 25ns is too short for the bandwidth of the delay line to pass without significant loss. Checking card for the second time I found one of the diodes had .7V drop measured with my meter instead of typical .6. Replacing diode got the pulse to proper 70ns and fixed the memory operation. Diode replaced was D5 on W607 rev D schematic. The front panel had been getting flakey with examine and deposit double incrementing and other behaviors. I had added a cap to increase the debounce time but only helped some. I went through my contact cleaners and treatments on the momemtary switches. They seemed to work well after so removed the extra capacitor and they still worked well. Entered the moving light test program without problems and it ran fine. Long ago I had put a temporary cap in on the processor backplane to replace a failed one. I replaced it with what I though was a match for the original cap and also a similar cap in case it was going bad. Caps were supposed to be exact match but found the one I removed was TE-1304 10uF 50V and the one I had with me was TE-1507 10uF 150V. Not going to matter just annoying that I got things mixed up. Ran the 5 processor diagnostics without error. The memory diagnostics failed intermitently. Checked the G603 memory selection matrix cards since they caused similar problem previously. Found and replaced one bad diode on second from left card. Thought everything would be good now but the machine decided to toy with me. Had a stuck at 1 fault for memory data bit 10. Traced to G007 card which input for core looked good but output was bad. Nothing found wrong on card with DVM. Put it back in and worked fine. Then machine still not running properly. When testing I noticed AC8 wasn't 1 when MB8 was 1 examining memory. MB and AC should both get the value from memory. The problem moved when I swapped R210 AC8 and AC9 card. After the machine was off for a while then turned back on the front panel light would light but would go out after a few seconds when reading memory. The fault also dependent on the value read from memory. If memory has 0014 AC gets 4. 0034 loads correctly and 0010 loads correctly. R210 is a complex card and little time was left so I packed up and brought the card home to hopefully fix. It has tape on it indicating I had problems with it previously. Haven't checked to see if it will reproduce in my machine.