As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STATUS MESSAGE L ELEV PCU WILL NOT ERASE. MESSAGE ERASES WITH NO HYD POWER APPLIED. RETURNS WITH HYD POWER APPLIED. DF'D REF MEL COMPLIED WITH MEL. 2721D. SAM NOTIFIED OF STATUS PER MEL. FOUND THE MOST INNER PDU INBD TO BE THE CAUSE OF MESSAGE. FOUND THE MOST INNER PCU TO BE THE CAUSE OF MESSAGE. REPLACED THE PCU.