Hi there-- A friend of mine has a Sherwood RV-5030R receiver that has worked well until yesterday. The receiver shuts off after about 5 seconds. It's not in an overly warm environment and it has airflow around. I tried pulling the speaker wire, and then all connections. Also sprayed some canned air inside but it was not overly dusty. Tried switching power outlets, no change. I suppose it needs to be serviced (not by me, I'm no electronics tech). Trying to figure if this thing would be worth it. Any ideas what might be wrong with this thing? Thanks!!