i880 keypad intermittent

Hi, I'm a newbie here. I have an i880 with a few keys that really have to be pushed hard to operate them. This is my third i880 with the same problem (others were replaced under warranty). I have a couple of parts phones lying around.

Can the foil membrane over my spare motherboard be removed by softening the glue with a heat gun and transfered over? Are there other ways to fix this problem?

All else failing, is there a supplier out there for the keypad foil on an i880?

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