Frustration abounds with this receiver. Finally got the time to complete the recap of the right channel amp which was giving me a problem. Replaced C702 - C704, C707 - C708, H701-H702, H720 - H721. Powered it up and let run for 1/2 hour, adjusted perfectly although quite a bit of CCW rotation of R742 to dial it in. Today the same task was performed for the left channel however R742 is at its CCW stop and 15mV is the lowest obtainable setting. What would cause such a condition?