Salvaging HP Laser Jet series II

Well, with the help from members of this list I finally got one Series II running and one not tested but saved back and two that were FUBAR. So, because I cannot bear to throw anything away all at once, kind of like the story of the three legged pig, i decided to scavenge what I could of the two Series II before pitching them. I just pitched the Series I, the 3, and the 4. I saved anything that had a wire connected to it and put all the plastic, sheet metal and gear trains into the trash on the theory that the gear trains looked tough enough to not be a failure point. I saved about half the weight and half the storage space. The fuser bulbs looked to be in good shape so I don't think they were the cause of the "50 Service" error I was getting. At least the filaments were not broken. I am assuming that this is like a halogen bulb and you don't want to touch the glass surface of the bulb. Is there a recommended cleaning procedure??? Too bad the fans are 24 volt not 115 volt. I could have used some 115 volt fans for my Kilowatt Linear I am building. Are there any parts I missed? Are there some parts I should have dumped?