What was found
AUTOPILOT B WILL NOT ENGAGE IN FLIGHT. GROUNDED - YES. DFCS FAULT REVIEW SHOWS NUMEROUS FAULT MSG #22-11340 (CH-B R SNSR EXC INV) & MSG #22-11338 (CH-B P SNSR EXC INV). ACCOMPLISHED FIM 22-16 TASK 829 & FIM 22-16 TASK 828. GVI FCC -B INTLK CB'S & CHECKED POWER WITH FLUKE, NO FAULTS NOTED. REMOVED & REPLACED FCC B (M1876) AS PRECAUTIONARY REF AMM 22-11-33. ACCOMPLISHED LRU REPLACEMENT TEST (GP 35) REF AMM 22-11-33/401, DFCS LAND VERIFY TEST (GP 49) REF AMM 22-11-00/201 & HGS SYSTEM TEST REF SMM 34-36-00, OPS CK NML. ALSO, ACCOMPLISHED FCC OPS SOFTWARE CROSSLOAD REF AMM 22-11-33-470-804. VERIFIED CORRECT SOFTWARES BOTH FCC'S.