Those DRAM chips are the large silkscreened Apple logo. My experience has been without exception that usually one or more of those chips will have failed by now. This is not the case for non-Apple branded DRAMs. Nothing conclusive, but I blame bit rot. If the poor storage conditions are at fault, then you may well find several chips have gone bad. But by all means clean it up first, reseat the ROMs and see what happens. Also looks for obvious signs of corrosion around the solder joints and pins.

That Resistor array was a standard modification to the 128K whenever they came in for repair (which tended to be a lot) in order to prevent a certain kind of lock-up that tended to happen. That's why there are so few original unmodified 128K boards, since almost always, at least this was done. Nothing to worry about. Focus your efforts on cleaning it.

As JDW points out, considering the storage conditions, there could be some caps on the logic board that have leaked. Though the state of the analogue board is definitely a good sign. Be sure to adjust the voltage on the analogue board before powering it up for use, as the caps are most certainly at the end of their life.

Speaking of JDW, good to see you casually posting. Had almost forgotten you were in Japan. I trust you and yours are well. Sending good thoughts across the Pacific.