As I continue to work on Showtime, working little problems first, such as the GI lamp under the replay unit wouldn't work. I reworked the socket soldering the socket base to the bracket. That didn't work so I checked for voltage and found none going to the lamp.
Onward I lowered the head mechanism board to the playfield and removed the replay unit to access the lamp wiring. One wire looked good as it went to the GI lamps that were working. But the other wire went to a loose wire that I followed to a open switch mounted to the base of the head directly behind the bottom of the head mechanism board that was lowered.
I couldn't determine how the switch was activated until I found a secret button well hidden under the left side of the head.
I assume this was somehow a protective method of hiding replays, until payout time. Push the button, note the number and power cycle the machine.
Picture of the switch and button follow.