Progress: PET up and running

Pulled the old PET (CBM 8032) out of the garage and plugged it in. INSTANT FAILURE, it only showed some 15000-something bytes free. After opening her up and pushing a DRAM chip back into it's socket (I replaced a defective DRAM chip with a socketed one some years ago) and hey-presto, but now the keyboard wasn't working, you really had to hammer some of those keys... So I took out the keyboard, removed all key-caps and posts and springs, and washed them (minus the springs) in the sink (the lettering is still yellowish, it didn't come off despite scrubbing. Is it nicotine, or by design ?). I then removed the circuit board and 'scrubbed' it using alcohol swabs (70% Isopropyl Alcohol), you get a big packet of these at the pharmacy. I also used them to rub down the conductive small black pads that are on the bottom of each key inside the keyboard assembly. Cleaned the dust off the assembly itself, put it all back together and it's working fine. Hooked the PET up to the GPIB Analyzer and ran some Basic commands, everything working fine. Next step is to dig up and clean my old 8050 drive to see what's going on in the GPIB bus.