What was found
ON NUMEROUS OCCASIONS TRYING TO SEND OR RECEIVE MESSAGES ON THE ATC PORTION OF THE FMC WAS VERY SLOW OR UNABLE (POSSIBLE JUST SATCOM). GROUNDED - YES. ACCOMPLISHED LEFT FMC BITE REF FIM 34-61 TASK 801. FOUND PGM FAULT, AND ETHERNET FAULTS LOGGED. PERFORMED FIM 34-61 TASK 837, 34-61 TASK 807. NO CURRENT FAULTS FOUND. PERFORMED FMC OPS TEST REF AMM 34-61-00-710-801 FMCS - OPERATIONAL TEST. SYS CKS NML. ACCOMPLISHED AMM TASK 23-15-00-730-801 - SATCOM COMMUNICATION SYSTEM - SYSTEM TEST. SYS CKS NML.