Recently I got a this problem with my Theatre of Magic.
Multiball only has two balls instead of three.
This happens usually from the second multiball I activate.
This is what happening:
1) activate lock
2) ball 1 locked
3) ball 2 locked, usually third ball is released in shooterlane, but now the third is released from the trap door (so the first ball that was locked) :S
4) ball 3 locked, multiball starts and releases two balls from the trap door.
Where's the third?
In switch test the Subway rollover switches are working fine.
Also the through opto's are tested fine.
When the second ball is locked or when multiball starts, I can see the remaining balls in the through (not stuck half way).
What can be the cause and fix?