Finally after getting beat up by countless multiballs, the diode on my glinda target broke off.
Poor glinda should look like a hockey goalie after fending off so many balls lol !
Got a check switch 74 in the self test. I hadn't seen that before.
Checked the glinda target and it worked in test.
Removed it from the playfield and the diode fell apart in my hand.
5 mins later after installing a new diode it's back up perfectly.
It's amazing how robust these standup targets are. Designed to take a beating, and they do !