Project: Repairing Elektor's Crescendo ME. Help wanted. Looking for parts.

[Electronic]

For some years ago I built the Crescendo ME as at project in a course. It played well during demostration. So well that people from other departments in the same building came and asked what was going on. And it had more to give. The limits where in my portable CD player.
After the demonstration I was finishing my report and wanted to add a Power Cube diagram. So I hooked it up to some equipment and started to meassure the values for different loads. Sadly it didn't like the most extreme values and the protectioncircuit wasn't built for this kind of loads I guess. It all ended with some smoke and a not so pretty smell. Pulled the cord as fast as I could but I had massive caps in the powersupply so two resistors started a small fire.

The resistors are marked red in the attachment and I also marked a possible way for the current. Not sure of the complete way. I'm pretty sure T12 and T13 are smoked. But my fear is that T11 is also smoked. On ebay I only found 2 adds for T11 (2SK537 Toshiba).
T12 and T13 are still easy to get.

Checked my report, the load was 1 ohm and 60 degree phaseshift. Alomost a short.

I guess I have to desolder T11 to test it but how? Anyone the a simple schematics for that?
T12 and T13 will be replaced. Can't think of any way they surrvived if the gate-resistor burned.

Anyone know how to replace T11 if its bad?

Beside the replacement parts I need  2-3 complete setups with parts to finish my 5.1 Crescendo ME.