I have a problem with my AVR-510. A few minutes after the unit has been turned on, the "PRO LOGIC" light on the surround mode indicator would flicker, then turn out. This is the second time it happened. The previous one was the "'DOLBY' DIGITAL" light. But the receiver was under warranty at the time, therefore no cost on the repair except for the 2 weeks of no home theater. I inquired from the same authorized service center and I was quoted $225 - 275 for labor and parts. I can't seem to afford paying that much for a minor problem like this. On the other hand, it's hard for me to ignore it knowing that I spent a "fortune" on this receiver. I expected that this type of problem for this kind of receiver should only occur once or never at all. Besides, it really bothers me the moment the light starts to flicker. At any rate, on the first incident, they "disassembled, located and replaced the intermittent LED diode." I was wondering if anybody can tell me if this is something I can do myself, and how. Otherwise, I can shop around, however, there's one shop that I called and since they don't have service literature for HK, they won't be able to determine if they'll be able to fix the problem until they have looked at the unit. They would charge $20 to look at it, which would go to the cost of parts and labor, and should they decide to go ahead with the repair, we're still looking at around $90. Or perhaps I should just learn to ignore the defect. I contacted Harman Kardon asking for some kind of assistance. Hopefully they would offer to help me. In the meantime, I can use your advice. Thanks.