Having some issues with my MM. In switch test mode if I push a switch other switches fire. I believe my issue is on row 5. Attaching a picture. Below is what is happening with the row.

switch 15 - switch 15 registers but immediately after switch 35 fires (opto)
switch 25 - fires normally
switch 35 - fires normal (opto)
Switch 45 - switch 35 fires first (the trough opto) and then immediately after switch 45 fires
Switch 55 - fires normally
Switch 65 - Fires normally
Switch 75 - Firest normally

I replaced the diodes on swithes 15, 25 and 45. No improvement.

Sort of scratching my head. I do have a dmm and can test the diodes on any switch. Any help would be appreciated.

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Thanks, how do you know if they are backwards. Do I check the row, column or could it be somewhere else?

Could this be it? Notice how each troll is wired a little different. Green on bottom on one and green in top on the other. Not sure which way it should go.

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Check out troll giving me issue. It has green on banded side. Dealing with kids right now. Will swap and report back in a couple hours. Plus culprits are normally from bad teching. I can tell this troll was replaced. Should I swap wires or diode or it doesn't matter as long as you do one or the other? Sorry, pic sucks but green definitely on banded side.

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Diode reversed on troll and drop target. Swapped them, all good!!!!!!! Thanks wellarmed!!!