What was found
UPON DISASSEMBLY OF ELEVATOR POWER CONTROL UNIT, IT WAS NOTED THAT THE CENTERING SPRING WAS MISSING. (NOT INSTALLED AT LAST REPAIR.) CUSTOMER REPORTED 'AIRPLANE PORPOISES IN A AND B MODE".
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
UPON DISASSEMBLY OF ELEVATOR POWER CONTROL UNIT, IT WAS NOTED THAT THE CENTERING SPRING WAS MISSING. (NOT INSTALLED AT LAST REPAIR.) CUSTOMER REPORTED 'AIRPLANE PORPOISES IN A AND B MODE".