I also picked up a RFM recently. The CPU fan was already noisy. After cleaning out the CPU box (the fan was rubbing the power cable insulation) I replaced the CPU fan and converted an ATX power supply I had. Had to get a new switch for the front of the CPU box, but the whole operation was pretty easy and will last for years.
I've identified 7 cherry switches that need replacing. i just ordered the full assembly (A-17813) and new diode. In the meantime it makes the game more challenging to play with 7 switches dead or intermittent.
Aside from a couple missing/broken plastics, one problem I keep having is the bulb above the left outlane breaking - even with a new tight rubber. It looks like with the outlane full open there isn't enough room for the rubber to stop the ball from striking the bulb.