What was found
ON FINAL APPROACH, WHEN SELECTING FLAPS FROM 20 TO 25 RECEIVED A T/E FLAP DISAGREE, COMPLETED QRH PROCEDURE. PERFORMED FLAPS 20 LANDING. CONTINUED PROBLEM ON GROUND. TROUBLESHOT IAW FIM 27-51 FAULT TREES 808 AND 803, COMPLYING WITH FSEU BITE PROCEDURES. NO FAULTS NOTED ON ANY FSEU'S. C/W OPS CK OF FLAPS NORMAL OPERATION AND ALTERNATE OPERATION IAW MM 27-51-00. OPS CKS GOOD. INSPECTED FLAP DRIVES, GIMBALS, ROLLERS AND TRACKS FOR ANY BROKEN OR DAMAGED PARTS, OPERATION IS SMOOTH AND PARTS ARE WELL LUBRICATED. INSPECTED T/E FLAP PDU ASSY INCLUDING BYPASS VALVE AND ALTERNATE SHUTOFF VALVE FOR HYDRAULIC LEAKS OR DAMAGE, FOUND NONE. SYSTEM HAS NO HISTORY FOR PAST NINETY DAYS. ACFT OK FOR SERVICE.