It needs a recap, nothing is going to improve until that gets done first. Washing the board got rid of the corrosive cap crap. Now you need to check with a high powered magnifying glass to visually check the traces and see if any of the cap crap broke any. Looks can be deceiving as traces can be broken under the caps or a chip. You won't know that until you start doing the recap. But at least the trace can be followed from end to end and wired up if it is broken.