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ucd90120a Alert problem

Hello,

My customer is using this part on a board… He is having an issue I do not understand. When attempting to read F3h, PMBUS Alert gets set, the read returns 4 (meaning the flash is corrupt). The chip is still functional, programmed and active.

Is this a known issue?  Should he ensure that a STORE_DEFAULT_ALL completes properly? 

Thank you very much for your help!