Just replaced the 13 caps with 100uF, 16V, 105C, 2000hr Panasonic caps from Avnet Express. 5 caps on top side of HDMI board were no problem, but bottom side was a bear. Discovered that one of the old caps actually exploded and scorched the PCB. No wonder none of the HDMI inputs were working any more! When removing that defective cap and the one next to it, one of the pads came off the PCB on each of the caps. Had to find a circuit trace to solder the side of the cap with the missing pad. Took a couple of white wire fixes to repair. Doesn't look like a work of art, but it did the trick.
Cabled the TX-SR876 back up and lo and behold all HDMI outputs and HDMI inputs work once again! However, I have another problem that i haven't seen discussed in this thread. If anyone can share some guidance, I'd greatly appreciate your insights. The switched outlet on the back of the receiver no longer switches. The outlet is on all the time. Consequently, I noticed the receiver stays warm all the time (I have a Cooler Guys quad fan unit on top of the receiver to keep things cool). The digital display on the thermal readout previously read room temp in low 70s when switched outlet worked, now it reads in the 90s with the cooling fans unplugged, but drops to low 80s with the fans on (have fan unit set to activate at 85F).
Is there some short or defective part that's a known cause of this problem that I can fix DIY similar to the HDMI caps? Would be nice to get the switched outlet to switch again and keep the receiver running cooler with the power off.