Anyone ever attempt repairs on CTI boards for DEC Professionals?

Hi, All, In preparing for my VCF-East exhibit, I went through my stack of DEC Pro gear. The good news is I had enough working hardware to get a Pro350 running Venix fully operational. The bad news is that I don't have enough working hardware to have even a second functional Pro. One of my RX50 controllers has a mechanically bunged up CTI ZIF socket. It doesn't look repairable so I'm probably going to have to replace it with a transplant from another board. One of my standard (mono) video cards displays bit garbage on power-up. I haven't found schematics for it yet (bitsavers has schematics for the Pro380 CPU, the RX50 controller, the RX50, the RD50). I could probably pull the RAM and test it outside the board, but beyond that, I'm stabbing at things. I did a lot of googling around and I haven't seen a lot of repair details on these. Not really surprised about that, but I figure it was worth asking if anyone has attempted component-level repair on DEC Professionals. I'm sure there's lots of experience with board swapping - that will definitely solve my problems. Oh... and I happen to be one video controller short anyway. I suppose a partial machine made its way to me at some point. I know my Pro380 used to be a console for our 8530. I was able to rescue the console at least. I probably got the Pro350s sometime in the mid-1990s when people were dumping them. I'm still a bit puzzled why I have *5* 256K memory cards. There's only 6 slots and once you put in the RX50 controller, the RD controller, the video card, and possibly the color bitplane extension card, you've got 2 slots left. One fun bit - I was able to break into the Venix box using the 'guest' account (I guessed there was one) and run John the Ripper on an i7 Linux laptop to crack all the hashes. 10/12 took literally seconds. One password was '82', another was 'Bob'. The root password took a few hours because it was two dictionary words. In the end, though, they all fell. The default root password for Venix is in the manuals ('gnomes'). They at least changed it on this box, but 1984 crypto is no match for 21st Century cracking. I don't see DEC Pro systems talked about much - they were kinda slow and definitely limited in their expansion. For a time, they were a cute packaged PDP-11 system but that CTI bus connector is a royal PITA. I am not shocked there weren't that many peripherals for it, but for a "desktop computer", how many different kinds of interfaces does the average office user need? If anyone happens to be coming to VCF East this weekend and has dead Pro gear, I could use a card to pull a CTI connector from. At least I should be able to get the one RX50 controller going. -ethan