Recently picked up a QX-949 with known issue: the unit drops in and out of protection, though it is mostly in protection. I don't seen anything obvious from visual inspection of the boards (from what I can see without disassembly). Will do a de-oxit of all pots and switches, but after that figured I will start with the power supply board and the two amp boards. Is there a recap list posted somewhere for this unit? Will also replace all the suspect transistors, but first have to look at what is on those boards. The service manual lists several transistors for each position. For example Q1 on the equalizer board is listed as 2SC1327-T or U and then lists in parenthesis (2SC1312-G or H, 2SC1344-E or F). I assume the transistor used depended on the board revision?