What was found
REF T/C 78222000 STEP 2.D.(5) FAILS. WHEN ATTEMPTING TO SELECT V/S MODE ON MCP, MINIMUM SPEED REVERSION ACTIVATES AND V/S REVERTS TO LEVEL CHANGE, WITH UNDERSPEED LIMITING CHARACTER FLASHING IN IAS/MACH DISPLAY. ACFT GROUNDED. SWAPPED FCC A & B, VERIFIED PROBLEM LIES IN FCC A. REINSTALLED FCCS IN ORIGINAL POSITIONS. R & R FCC A, NEW PART BAD FROM STOCK (MESSAGES 22-11337 & 22-11339 PITCH & ROLL SENSOR EXC INV = 10 VOLTS). REMOVED, REPLACED, AND TESTED FCC A IAW MM 22-11-33-400-801. TESTS PASS. ACCOMPLISHED DFCS LRU REPLACEMENT TEST IAW MM 22-11-33/401, DFCS LAND VERIFY TEST IAW MM 22-11-00/201, AND HGS SENSOR TEST FOR FCC/AT IAW SMM 34-36-00. ALL TESTS PASS (FOR A & B FCC). ACFT REMAINS CATIIIA AUTOLAND & HGS, SCREW REFLECTS SAME.