Entertainment Center: TVs, Stereos, VCRs and DVDs - sony str d915

Hi, new to the list... my SONY STR D915 suffered from a power surge in my studio building. Now when I turn the speaker selector to either A, B, or A+B. The display flashes "PROTECTOR". The main fuse is not blown. When the speaker selector goes to off the unit powers up fine but (obviously) doesn't make any sound. I'd like to DIY this. I know a fair amaount about electronics as I build my own analog synthesizers and frequently repair electric guitar gear. I talked to SONY but they (obviously) want me to bring the thing in and weren't too helpful. They did tell me that there are a number of fuses inside as well so I thought it could just be one of these just wanted to get some idea of where I'm at before I crack the sucker open.
Thanks
Gavin

Hi Gavin
Hope you haven't paid someone to repair the 915 by now.
Have repaired the d915 a few times.
1) Short output transistors or drivers (all on ali heatsink).
Easy to check in situ with power off. Usually only one pair fail at a time.
2) IC701* internal failure, giving Vcc and/or Vdd to output transistors.
With power on .....compare volts on o/p transistors (they won't all be
short).
Each pair of transistors should have Vcc and Vdd respectively,
on the centre pin.
3) If any of above have failed, check both halves of resistors R715, R672,
R765.
4) Check all fusible resistors R759, 760, 629, 655, 654, 668, 664,710, 709,
717.

*Note Check data sheet of IC701 (STK3102) on DataSheetArchive.com.
Can be interesting to research fault before fitting new components.
Regards
Tom