I think I have this problem and will be attempting the 'punch' fix tonight. For those that did not understand the diagram that was put up in an earlier post, have a look at the attached photos and I think you will get a better idea of what we are dealing with. You can even see the 'factory'...
I'm very happy with my Anthem MRX 300. Got it for a good price and powering Mirage Nanosat 5.1 speakers. The Anthem room correction makes a huge ge difference to the sound once you set it up.
Last time I took mine to Edgars Tyrepower in Blackburn Rd. Seemed to do a good job and new what they were doing. I think it was Rob Fairley that recommended them. Wasn't more than a standard wheel alignment either.
I used Nulon Full Synthetic 75W-90 Performance Smooth Shift Manual Gearbox and Transaxle Oil. Hasn't skipped a beat since. I think it is smoother than the previous oil. Granted, I have no idea how long it was in there for.