I have a Au-4900 that was cracking and poping so I put it away for about a year. I have some time on my hands and decided to see if I could fix it. So i took off the cover and found that R36 was burnt found the service manual and replaced it. when I turned the unit on the R36 burns out. Any idea where i]I should look for this issue. I did notice that r28 has some oxidation on one of the legs (will replace) would that be the problem?