It's not that it locks up, it boots into Workbench but the mouse pointer never changes back from the "wait" clock symbol to the pointer. It just stays that way like it's waiting for something to finish loading. I'm able to move the mouse around but I can't actually click on anything. I booted without the startup sequence a bunch of times and commented out anything I thought might be the cause but it didn't help. A corroded Paula socket can cause all kinds of weirdness so it was either that or something loading up when it boots. I'll figure it out once I'm done fixing the motherboard.
That damage isn't nearly as bad as one of my other 3000s where I had to carefully reconstruct a bunch of traces with strips of copper tape. In fact I think I posted on this site about that repair last year.
Fortunately in this case all the traces are actually still intact so if I get lucky all I'll need to do is tin them for reinforcement, doctor up a few ugly vias to ensure they don't eventually break down, and patch up the solder mask. Even the sockets cleaned up really nice from the Tarn-X treatment...which is good because those old TZT sockets Commodore liked to use seem to hold tighter than any new premium sockets I've tried.
Anyway, I'll be sure to follow up once I get it fixed up and back together.