Thought I should share this tip: The schematic for this unit is available but barely legible for finer detail. After a bit of a struggle :/ :/ If you have one of these that looks like should be OK, but won't come out of protect: Change C824 (10uf/50v). This cap was leaking electrolyte but not visibly. As soon as I heated the leads to remove the cap - obvious electrolyte smell. The protect circuit is driven off the -Vss rail and involves an array of transistors (Q809 thru Q816) and looks like C824 provides a time out to ramp up a -24v feed for relays, muting circuitry and the protect LED. C824 is located near the edge of the power amp board.