This receiver was rebuilt by me, using information on this forum last year. Everything was working fine till yesterday when suddenly left channel power meter has become "oversensitive" even at 1/4 volume it is hitting the maximum mark. Pressing meter button has no effect and swapping input leads has no effect either. Pressing the mute button does reduce the amplitude of needle movement but still movement is far more on the left meter. When the receiver is powered on and nothing is playing, both needles park at exactly the same place, right in the middle of the bold line on the extreme left side of the scale. Before posting, I have looked at this link, http://audiokarma.org/forums/index.php?threads/9090-vu-meter-adjustment.620904/ however, it feels beyond my technical expertise. Am I correct in thinking that I can download a 1KHZ sound file and play it after attaching 8 ohm resistor across speaker terminal and adjust the trim pots on protection board. I am scared to blow the output transistors by putting a resistor across the speaker terminals. Also as the problem is of sudden onset, the problem is likely to be somewhere else and not the adjustment I feel and welcome any guidance as always.