What was found
FMC COMPUTED N1 FOR NR 1 ENG DISPLAYED ON T/O PAGE IS NOT CORRECT. IT DOES NOT ADJUST/CHANGE FOR PACK ON OR OFF. ACFT GROUNDED. PERFORMED LT PACK CONTROL VALVE FUNCTIONAL INSTALLATION TEST REF MM 21-51-01, STEPS 4GH. OPS CHECK AND LEAK CHECK OK. CONTINUED T/S, FOUND LT PACK SWITCH POSITION DISAGREEING WITH FMCS DISCRETE PAGE INDICATION. REPLACED P5-10 AIR CONDITIONING MODULE IAW AMM REF 21-51-65-000-801/21-51-65-400-801. OPS CHECKED GOOD. RECIRCULATION SYS CHECKED GOOD IAW AMM 21-25-00-710-802-002.