What was found
CHECK PFD 1 ON PFD, CHECK ED ON MFD, CHECK PFD 1 ON MFD, CHECK ED ON ED. CYCLED POWER OF NR 1 MFD BY SWITCH. ALL FAULTS CLEARED. C/W MFD1, PFD1, ED OP'S CHECK IAW MTC 6316101, 6316104. AMM TASK 31-61-01-710-803. C/W CAT III RTS TEST PER TASK MTC 6316101, 6316104. AIRCRAFT REMAINS CAT III. AIRCRAFT PLACARD READ CAT III. NO RELATED FAULT FOUND IN CDS. COULD NOT DUPLICATE. RETURNED TO SERVICE.