AIR-LAP1131AG-N-K9 getting failed repeatedly

Hi Experts,
we are having more than 250 - AIR-LAP1131AG-N-K9 access point installed,
We are facing issue in access point which SN is starting from FTX1216, its getting failed and not starting by PoE or power adaptor (dead)
i analyzed all these failed access points and found that a copper metal foil which covered on some part on PCB of Access point is half removed. and all this access points are 3 to 4 Years older. is there any way to stop such failures.
find attachted snap shot.

Using a TFTP Server to Return to a Previous Release
http://www.cisco.com/en/US/docs/wireless/access_point/conversion/lwapp/upgrade/guide/lwapnote.html#wp160918
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