Heat sink glue?

[BrianG]

Well, you can either send it to Castle, or re-epoxy the heatsink back on there. Just make sure to clean the old stuff off the heatsink and the FETs first (and be careful). I use a flat-bladed exacto to scrape off the major stuff, and then use denatured alcohol to clean everything.

Then, get the Artic Silver Arctic Alumina. Do not use the regular AS epoxy as it contains traces of silver, and while it is not supposed to be conductive, it does have some capacitance which could cause problems if any got on the FET leads.