Ok, there is something flaky with those opto's. First thing to do, take off the glass, look inside the elevator, you will see the 2 opto's at the top, get a q-tip and clean both of them.
The other opto's are only accessible from the bottom of the playfield. you will see a connector going to a board on the elevator, see if you can unplug it, and plug it back in, if the elevator is UP and you look at it from the correct angle, you can see the 2 opto's that the connector is connected to, these are different opto's they are black and look like a u only not curved at the bottom, if you take another q tip, you can get inside of them and clean those as well, windex or rubbing alcohol will work for the cleaning, just wet the tip of the q tip.
If you want to pre test the top opto's put the game in switch test, make sure the elevator is down, and just by putting your finger in the elevator shaft should break the beam and show up on the dmd.
Hold should NOT be solid the entire time, just when the elevator is at the top.