Just find out what ICs it uses and put them in. DIYers do this all the time with CRT tech. lcaillo (Len Caillo) has a great tutorial over at HomeTheaterShack.com. Search it out and follow his lead.
Be sure to use generous amounts of heat sink compound. I just visited a home where none had been used 2 years ago, and now it had gone out again on 1 of the 6 channels and the entire IC replacement job had to be repeated. This was a model with 3 ICs rather than the usual 2. The amount of heat those ICs produce is serious and needs to be bled away to the heat sink fins for convection cooling, and the tech who had done that job was totally derelict in leaving all 3 of those ICs dry! De-secured them and they flopped forward, loose except for the legs still being soldered. When proper amounts of the compound are in there, they are stuck to the heat sink nicely and won't move.
Edited by Mr Bob - 8/26/13 at 7:16am