fix two fried amps?

The first thing you need to do is make sure the transistors that you are not changing remain soldered to the strip. 

 This is achieved using a binder clip available at Office Depot.

The easiest way to remove the transistor is to cut the legs off of it, so when it heats up it will be easy to just knock it off of the strip.

I forgot a step.  First and foremost you need to use a razor blade and remove all of the compound from the bottom of the strip.  It burns really bad if it drips on your finger while applying the heat from the torch.

After removing the transistors you need to apply an a thick layer of solder to the top of the strip.

Then we need to apply a healthy layer of solder to the back of the new transistors.

If you heated the tab of the transistor, you need to check the transistors to see if they are shorted.