What was found
ON APPROACH TE FLAP DISAGREE EICAS CAUTION DISPLAYED. FLAPS 25 S ELECTED.FLAPS AT 20. FLAP DISAGREE, INTERMITTENT TYPE, MESSAGE 305. PERFORMED GROUND VISUAL INSPECTION OF FLAPS, NO DEFECTS NOTED, HYDRAULICALLY RAN FLAPS TO ZERO & CYCLED DOWN TO 30 & BACK TO ZERO. PERFORMED FSEU 1, 2, 3 BITE TEST IAW MM 27-51-00. NO EXISTING FAULTS ON ALL FSEUS. FAULT HISTORY ON LEG 0 SHOWS AGAIN DURING FSEU TEST MM 27-51-01/201. NEW FSEU WAS REMOVED AND ORIGINAL WAS INSTALLED INTO NR 1 POSITION. NOTE FLAP ISOLATION VALVE MSG ONLY APPEARED GOING FROM FLAPS 1 TO 5, OR FROM 5 TO 15. FURTHER EVAL ALSO SHOWED MSG FLAP ISLN VLV ON FSEU 1 UNDER FL 0. CONTINUED T/S PER FIM 27-51T818 FOR THE FLAP ISLN VALV MSG. R & R FOUND NR 1 FLAP TRANSMISSION OVERLOAD INDICATOR TRIPPED, RESET NR 1 FLAP XMSN OVERLOAD IND PER FIM 27-51. FOUND FLAP PDU POSITION IND MOUNTING LOOSE ON PDU ALL OTHER FSEUS NO FAULTS REPORTED. T/S PER FIM 27-51 T 811, THE DEPRESSURIZATION MODULE PRESS SWITCH & CARRIED OUT ASSOCIATED FAULT TREE 808 & REPLACED XMSN FLUID PER MM CAUSING EXCESSIVE PLAY. MP INSTALLED NEW FSEU IN #1 POS. PERFORMED FSEU TEST REF MM 27-5. OPS CHECKS PER AMM 27-51-29/201, ALL OPS CHECKS PASSED. AFT 12-13-06-603-029, NO MAGNETIC METAL FOUND IN FLUID 1-01-722-005. KEPT GETTING FLAP ISLN VLV STATUS MSG PREMATURELY. OPS CHECKS LOWERED FLAPS/SLATS. FLAP ISLN VALVE MSG APPEARED R & R T/E FLAP PDU POSITION INDICATOR IAW AMM TEST PASSED.