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I've had success adding solder to only one side of the ROM SIMM. Since you're probably not going to be able to make all pads the same thickness, you just make that side a bit thicker so that the unchanged side is more firmy pushed to the contacts of the socket.

Yes, I've tried different RAM; also I forgot to note that my measurements were taken without any RAM SIMMs in the board.

Here's what this looks like on the scope (D2 yellow, RABF6 cyan):

Thank you for your responses and ideas. I was also wondering how the address multiplexers could have anything to do with the data lines, and have checked the diodes but they seem fine. I've replaced the 68030 to see if there was anything wrong with it, but that didn't change anything. My...

I'm trying to repair an SE/30 that didn't start at all (black screen). I've made some progress - after recapping, cleaning the board, and replacing UD8 and UE8 which were badly corroded, I get chimes of death and the screen is showing a checkerboard pattern with a few vertical lines...