I finally am getting back to working on this. I have spent most of my time lately in trying to fix a Black Hole.
I checked all diodes and they are fine. I ended up sending my Rottendog board back to Jim Knight - great guy and great customer service - and lamp row 7 (Q61) was blown. He fixed and returned the board. Installed the board and still have the same problem - top right rollover lane activates left return to flipper lane, green drop target lights continually flash, red center target lights seem to have a mind of their own, and top yellow drop target lights do not work properly.
Please take a look at the attached photo. The disconnected red wire was attached to the top right rollover light power lug and connected to the center power lug of the yellow drop target lights - seemed strange. I disconnected it as you can see in the picture. I now no longer have the issue with the top right rollover activating the left return to flipper light. I have not be able to find schematics so do not know why this wire was connected that way. Could this connection have been the issue? I still have the constant flashing green lights, etc. Thiniking the transistor may have already blown again, I checked continuity on the transistors. Assuming I am doing it properly - black probe grounded and red probe on the transistor - all transistors still check out okay. I don't know which one Jim replaced so I checked them all.
I would welcome any help.