[vcf-midatlantic] Help! Stuck bit

Hey VCF peeps! I’ve got a Briel Altair replica that has a stuck bit on the front panel. I’ve verified that switch (bit) 5 lets me deposit a zero or one into any given memory address. But when I go back to examine it, it always show one regardless of the actual state of the bit. I verified that the switch is good, the led is good, and I replaced all the 74 series latches without effect. There is a 220 ohm resistor in line with it that reads 216 ohm but that should be well within spec for a 5% resistor. I could replace it with a new 2%, but I’m not sure that would fix anything. Anyone have any ideas why this bit always lights when I examine it? Thanks. Dean