Removal (difficult) of PCB from heatsink??

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Hello, I have a question about technique. I'm attempting to remove an output pcb from a heatsink. The pcb is mounted via 10 mofset transitors w/ screws onto the board. In between the transitors and the heatsink is a tan colored sheet of vinyl. How does one delicately remove the board from from the heatsink without trashing anything?? It seems as though the manufacturer has glued them together?! Thanks
 
...responce to "eyoung's" photo request...

The amp involved is a B&K 7250 II bought locally for a couple of hundo's from a guy who said it had a blown out channel. It merely had a noisy, sizzling .12uf cap which I've since removed. I've got dozens of new elnas ready to populate the boards :D> In the attchd photo you can see what is believed? to be silpad material between the transistors and the heat sinks.
 

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