Make sure the moon/magnet hold feature is working.
It uses a (touch pad) sensor switch which detects balls that are held for multiball........be sure that this is functioning as well as it is expensive to replace. An Apollo that I worked on had these problems which I found out later to be quite common for this title.

The pin looks great and plays well..........................13 ball multiball is crazy but fun. Price????? wouldnt expect to pay more than $2500 for one.