Verification

Test	In the mold shop repair log, count last quarter's repairs. Mark each one that was logged after the mold failed in a press, and note the mold and what went wrong. Then list the molds that appear most often.
Cost	About $96 of the mold shop lead's time: about two hours with the log, at $48 per hour. Nothing is bought.
Duration	About two hours with the log
Confirmed if	Most repairs followed a failure in a press, on a small group of molds. Most of them name a stuck part, leaking plastic or a worn part.
Ruled out if	Most repairs were planned, or the failures are spread evenly over many molds. A counter on eight molds would then prevent few stops.