As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BRAZILIAN AIR LINES SENT RUDDER PCU TO REPAIR STATION AU4R FOR EVALUATION FOLLOWING FAILURE ON PRE-FLIGHT TEST PER BAC SB 7371202. FOUND UNIT FAIL TEST 12C SECONDARY STROKE/FLOW OF BAC CMM 27-20-01 AND CAUSE WAS IMPROPER ASSY OF SERVO CONTROL VALVE AD 94-01-07 AND 95-06-53 APPLICABLE.