This is why I don't like replacing components at random because of the potential damage to vintage PCB tracks etc.
There is a high probability of "cause and effect", so the (new) fault is highly likely due to the work that has just been performed. So, you need to get the machine back to the previous state.
Don't forget that this is a two layer PCB, so some of the damaged PCB tracks can go through vias on the board - which may be the through the pins of the RAM. This is a job for your multimeter to check for continuity where there should be continuity and no accidental short circuits where there shouldn't be any. Multimeter set to resistance and the circuit diagram and a highlighter pen in your hand as you check the various segments of PCB track out.
Dave