Wanted: Laserdisc player service

Is there anyone out there who can repair LD players? I have two that currently work, and I'd like to keep them that way. I am using them with the Domesday Duplicator, and the RF output on my Pioneer DVL-919 has a kind of "pattern" of droputs - fixable after the fact, but better if they don't need fixing. I'm told I maybe need to get some kind of calibration?



I am in Philadelphia if that help any.