First step is to isolate the issue to the pcb or to the wiring / pf. This should be easy to straighten out.

Pull the column and row plug off the board.
Game in test mode.
Use an alligator clip to close switches right on the connector plugs. Use the switch matrix diagram / schematic to find the pins.
If you find nothing reads on your bad row, the issue is on your driver board. If it does read on the bad row, the problem is on the wiring to the PF.

If you find the issue is on the driver board, check the connector pin solder joint. Otherwise we need to test the rows. The rows are the "read". So there is a 4049 chip that has a pull up resistor waiting to get pulled down. Look for the input and output of this 4049 gate to change state when closing the switch. Compare it to other rows if you are unsure.

If the 4049 tests good. Need to pull the driver board, go to the bench with test rom and make sure the associated PIA leg can change state.

When someone shorts coil voltage to a switch line, it will blow out the 4049 or 7406(column drive) chip on the driver board. That happens a lot.