Since I've done this a gazillion times now....
There are two screws under the flap..
There are two screws on the left outer edge
There are two screws in the back that hold the switch plate to the diverter mechanism. You have to hold the diverter in the activated position to get one of them
There is one screw on the right side into the wood rail
Then you need to lift the playfield and unplug the wire from the ramp.
If your are lucky, the male end of the plug will be the one that goes to the ramp. Only the male plug will fit through the slot cut into the playfield to feed the wire up to the top. Will also help to pop the two rubber bands in the back loose on the right side. If your game is like most so far, the bigger female plug is the one on the ramp harness. In order to get this through the playfield so you can remove the ramp, you will need to remove at least the three screws on the right side of the machine that hold the back board on. (Look back through thread to see my stop light relocation photos...there you can see the three screws I'm talking about) If you remove the playfield this is really easy to see. It can be done with the playfield lifted and a little coordination. With those 3 screws removed, you can give a light "rap" to that side of the backboard and it will pop loose giving you enough room to feed the wire through.