What was found
ON TAXI OUT N1 RPM VALUES WERE SPLIT BY .7 (NR 1 ENG 86.1 NR 2 ENG 86.8). N1 CARROTS WERE ALSO SPLIT. LEFT PACK VALVE FAILED TO OPEN TWICE WHILE OPERATING. PERFORMED FLOW CONTROL & SHUTOFF VALVE TEST REF MM 21 51 01 STEP G, ALL TESTS GOOD. PERFORMED ENG RUN & ACCESSED THE DISCRETES PAGE FROM THE FMC'S & VERIFIED OVER 35 TIMES THAT THE LEFT & RIGHT PACKS TURN ON & OFF WITH SWITCH AND VERIFIED THE PACKS ARE ACTUALLY OPERATING & VERIFIED THE N1 CARROTS MATCH. ALSO PERFORMED BITE CK OF BOTH ACAU'S NO FAULTS FOUND. VERIFICATION FLIGHT SUCCESSFUL. OPS NORMAL.