Quoted from markp99:
That switch diode seems to be a common issue - must see a lot of shock with the ball hitting that scoop so often. Mine was broken when I got this machine (actually was ~attached with come sort of conductive epoxy or something - odd). Last week, I had to re-repair the broken solder joint at this same location - my old solder repair from 2000 had failed.
Previously, I had just tacked the loose diode end onto the solder connection. This last time, I removed all the solder from that switch lead and passed the diode end thru the hole before soldering back on. Hopefully the last time I visit that connection.
Isn't this where you can put a big glob of hot glue over that switch lead after soldering to help reduce vibration? You may be aware that later production JPs actually moved the diodes from those switches off the switch itself onto a stand alone assembly mounted to the playfield because of this issue.