What was found
A/P A AND B +A/T UNRB AND FAULTY/N1 SETTINGS ALL PHASES/FLT DEBRIEFED CREW. CREW REPORTED AUTOTHOTTLES WOULD NOT MAINTAIN COMMANDED THRUST DURING CLIMB, SET AT 95.1 PERCENT AND WENT TO ONLY 74.0 PERCENT, CREW DISC. A/T. DURING CLIMB ON A/P "A" A/C PITCHED OVER TO LEVEL OFF, VNAV NOT ENGAGING. CREW DISC. AUTOPILOT "A" AND THEN ENGAGED A/P "B" WITH SAME RESULTS. CREW VERIFIED CORRECT INPUTS IN FMC AND CORRECT BUG SETTINGS. SAME ON DECENT NO VNAV. PERFORMED DIGITAL FLIGHT CONTROL SYSTEM OPS TEST IAW AMM 22-11-00-740-801, AUTOTHROTTLE SYSTEM OPS TEST IAW AMM 22-31-00-710-801 AND FLIGHT MANAGEMENT COMPUTER OPS TEST IAW AMM 34-61-00-710-801. NO PREVIOUS FLIGHT FAULTS AND NO CURRENT ADD EMP:U446791 FAULTS. ALL TESTS PASSED. PERFORMED ONLY LAND VERIFY TEST PER AMM. 22-11-00-700-801. ALL TEST PASSED. A/C REMAINS FULL CAT CAPIBILITY.