You can Pull the corresponding connector for the DT switches at the mpu and enter test to see if they’re still active. If they stop, you can rule out a short on the board, and focus on the playfield.

If it’s the lower left 5 DT bank, double check that none of the wires or switches on that bank are bent/shorting to something.. That area is tight and on the edge of the playfield. Tidy up the wiring as best as you can.

On the maverick project I’m finishing up; That bank was replaced by a previous owner. The original was most likely damaged from the playfield getting dropped inside the cabinet as both of my mdf strips on the inside of the cabinet were busted/gone. I pulled the old staples/nails so nothing was touching the underside of the playfield.

In my case, the drop target bank they replaced the original with was obviously from a different game. Double check the connector from your DT bank to the harness and make sure your wiring matches up to the rest of the main harness/schematic, reconfigure accordingly.

A couple of my switches were out of adjustment and closed as well as wired to whatever game the DT bank came out of. This caused all kinds of crazy switch problems for me.