What was found
COMMAND "A" DISENGAGED ON FINAL; REVERTED TO SINGLE CHANNEL. GROUNDED - YES. PERFORMED DFCS BITE IAW B737-800 AMM 22-11-00-740-806. NO FAULTS LISTED ON PREV FLT LEG FOR CHANNEL A OR B. NO A/P DISC FAULTS PRESENT. CURRENT STATUS TEST PASS. PERFORMED DFCS LAND VERIFY IAW AMM 22-1100-700-801, ALL TEST PASS. LRU REPLACEMENT TEST FOR FCC/DFCS-AT IAW AMM 22-11-33/401, NO FAULTS FOUND. A/P CHANNEL "A" CHECKS GOOD AT THIS TIME. ALSO, PERFORMED HGS OPS TEST IAW HGS 4000 SMM 34-36-00 SEC 500. TEST PASS. NO RELATED FAULTS ON RECORD FAULTS LAST 10 LEGS.