check for wire or solder connections that might have come off

The left and right drop target bank switches all feed into a common line that eventually reach the G relay to score (after passing through a couple other normally closed switches). The schematic shows that the right drop target switch signals feed this line 'below' the left drop target switches, so if the right targets are working but the left ones are not, then that suggests there's an open in the line between the left and right banks.

So yeah, you're probably looking for a loose solder connection along that wire, but where it passes from the left bank to the right bank.

Lee and Gordon have the lower plastics available:
http://www.pinballrescue.net/Plastics_Abra_Ca_Dabra.html

(scroll down to see the partial sets)

They make terrific repros.

we will have another player in the repro plastic realm soon. Wade K. got a laser cutter and will start doing more plastics soon. it is always a good for the hobby when we have more QUALITY repro parts being produced.

Awesome!

Still lots more titles to get covered, so very cool.