Shorted My Amp Out

Hello All,

I should have turned the Hafler P1500 amp off before connecting speakers but I didn't. 2 speaker wires shorted, sparks, etc., now the amp does not work. Where do I start to get it working again?

I can solder and I have a multimeter. I am not an electronics guy but am eager to learn.

Thanks in advance for your help and Happy Holidays!

Bill