What was found
WEATHER RADAR SYS ADVISORY WXR FUNCTIONS HAVE FAILED OR PARTIALLY FAILED ON BOTH LEFT AND R IGHT SIDES OR MANUALY SELECTED TO A FAILED WXR. FIM TASK REF : 34-40-F2-A8A-421A-A CMC MSG# 3460111 FLIGHT STATUS: A INTERMITTENCE CODE: I PH: CLIMB NARRATIVE: RIGHT INTEG SURVEILLANC E SYSTEM PROC UNIT. RECENTLY REPLACED WXR RADAR ANT DRIVE UNIT P/N 78-3443-9-9003 S/N 8340 HAS POOR RELIABILITY (PREVIOUSLY REMOVED FROM OTHER A/C < 1MONTH ON WING 2X, + REPORTED BAD FROM STOCK 1X). ADD FAULT: 34-60111 REMOVED AND REPLACED WEATHER RADAR ANTENNA DRIVE UNIT REF AMM 34-42-03 OPS CHECK AND FIBER OPTIC INSPECTION STILL NEEEDED. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1711957 SN OFF 0040 IPC REFERENCE # 34-42-03-05 DRIVE, ASSY, DR OFF 78-3443-9-9003 8340 ON 0000 DRIVE, ASSY, DR OFF 78-3443-9-9003 8340 ON 78-3443-9-9003 0474 PERFORMED FIBER OPTIC INSPECTION, ALL OK. REF FIM 34-40-F2-37A-421A-A. AFTER INSPECTION PERFORMED ISS OPS TEST. TESTS OK. REF AMM DMC-B787-A-34-42-00-21A-320A-A.