What was found
ON FINAL FLAPS FAILED AT 8 DEGREES. WE WENT AROUND, CLIMBED TO 10,000' COMPLIED WITH QRH AND RETURNED FOR LANDING. NO BRACE OR EMERGENCY DECLARED. AIRCRAFT REMOVED FROM SERVICE. INTERRROGATED THE FECU, IAW FIM 27-50. FOUND NUMEROUS FAULT CODES FOR THE PDU. R & R FLAP PDU, IAW AMM 27-52-01. OPERATIONS CHECK GOOD, REMOVED FROM PLACARD AND REMOVED FROM MEL.