Quoted from Quench:

Oh dear, that coil connected backwards should have caused the playfield fuse to blow and potentially the Q8 driver transistor on the solenoid driver board when activating the 7 Drop Target Bank Reset coil. It was essentially acting as short circuit across the coil. The Black-White wires must connect to the non-banded (anode) side of the diode across the two coil lugs. You need to then somehow install the isolation diode between the Grey-Red wire and the coil lug with the banded (cathode) side of the diode. This diode prevents voltage going back through the windings and powering other coils in the circuit.
See the diagram below:
The missing diode(s) on the 7 Drop Target Bank Reset coils (shown in the pink box) is allowing voltage back onto the Grey-Red wire causing the 2,10 Drop Target coil to activate when the 4 Drop Target Bank reset coil activates. That missing diode is required to isolate power from coils not being selected by the solenoid expander.
[quoted image]

Quoted from Quench:

Knock down the 1 to 8 drop targets so D-E-L-U-X-E is lit.
I presume you're saying at this point if you hit the first E target, all the playfield D-E-L-U-X-E gets spotted?
Anyway if yes, then get the D-E-L-U-X-E targets lit and manually raise *every* drop target in the game including the inlines.
Navigate a screw driver behind the drop targets to activate the E target. Does all of D-E-L-U-X-E get spotted? If no, then start dropping individual drop targets until you determine which ones cause the problem to occur.