PDP-11/05 returns to life

I managed to coax my PDP-11/05 back into life today and ran a few simple programs on it successfully. As a result a few questions for the experts out there: 1. To get it up and running I had to replace its two fans both of which had failed which I did by scavenging another 11/05 chassis I have. Does anyone have any tips on reviving failed fans? Both spin freely by hand but when powered one hums heavily and the other reluctantly and somewhat noisily spins up (if kick started with a screwdriver). If recovery is impossible can anyone suggest suitable replacements? The current ones are labelled Super-Boxers 2. Is there a chasing lights program I can run on the 11/05? Would be nice to see it visibly doing something 3. At the moment the machine has 16KW of core (2 x 8KW planes). This together with the CPU fills all but the last slot on the Unibus (its a 5inch box so only 9 slots). I'd like to fit a DL11 so that I have some serial comms and ideally an RX11 as well so I can hook up my RX01 drives and boot RT-11. Can I make use of the 9th slot or does this have a special purpose? There is a lot of wire wrap going to slot 9 so I'm guessing its not suitable. 4. What versions of RT-11 is suitable for an 11/05 and what is the minimum memory to run it? Thanks, Toby -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.