Guys, I have a Ball/Efratom Model PRFS 102 that has lost lock as of late. I got the unit used a few years ago and it would acquire lock in about 3 minutes but now it will not lock at all. The heater is drawing current, at first turn on it takes about 1.4A and in about ½ hour it draws about 100ma. So the heater appears to be working but no lock. The internal oscillator is P/N 100318-003 and I opened it and it has 4 pc boards connected with a flex board and they are built around the physics module that in a deep draw case so that I cannot see the lamp. If I take the bottom cover off of the module I can see the physics case and I think it has a hole in one side – is that to view the lamp? I am told that the lamp fails because the RB is coating the inside of the glass and it can be revived by heating the lamp with a heat gun. Is that true? In this model is it easy to get to the lamp or is it more like brain surgery? There is a similar module on Ebay P/N100318-001 but it has a board on the side instead of the subD connector and the board on the side may hit the power input block on the back panel. I could buy it at $149. I am an electrical engineer that worked at Motorola for 37 years and have used one of these at Moto a few years ago. I have enough test equipment to do the job… can you give me some help to get it running again. Thanks, Mike