Hi

> What have I most likely done to it, and is it easily repairable
>

It is difficult to tell. Assumingly one of the two voltage regulators:
IC5 (looks like a power transistor) or IC4 (looks like a transistor).
See http://www.doepfer.de/a110_tec.htm
I'd plug the module in again and would test with the tip of my finger,
which IC gets hot...

Florian