[HELP] Not sure where to post this but this seems like a good start - Linear encoder repair

[Vinny]

Both the black things (both legs) and the clear things (both leads) and check them 2700 things too. You can just leave the black probe connected to ground, but you may also want to measure across the clear and black things. Across the clear and black things if there's a voltage drop it'll tell us if they're good or not.