What was found
FLT#760, PHL-BOS.' (AIRCRAFT DIVERTED TO JFK AND DECLARED AN EMERGENCY) FLAP FAIL EICAS MSG WHILE RETRACTING 1 TO 0 ORH C/W. MSG DID NOT CLEAR; FLAPS INDICATED 0 IN AMBER; REF LOGPAGE 4274864 ITEMS 1 (PERFORMED TROUBLESHOOTING AS PER FIM 27-51-00-810-801-A. FOUND R/H PSU DAMAGED RIG INDICATOR BROKEN. R/R PSU PER AMM 27-53-04. OPS CHECK FAILURE ORIGINAL ANGLE OF ADJUSTMENT OF PSU WAS 25 DEGREES WHEN RIG CHECK NUMBER OF DEGREES CHANGED. RIGGING REQUIRED.) & 2 (PERFORMED RIGGING OF RH PSU IAW AMM 27-50-00-820-802-A/200. OPS CHECK PERFORMED IAW AMM 27-50-00-710-801-A/500. OPS CHECK PASSED) FOR REMOVAL AND REPLACEMENT OF FLAP PSU R/H & RIGGING. PERFORMED OPS TEST OF FLAP/SLAT IAW 27-50-00 NO DEFECTS NOTED NO MSG PRESENT OK FOR CONT SVC.