What was found
ON DESCENT IAS/MACH BUG FROZE AS WELL AS MODE CONTROL PANEL READOUT. CYCLING FLIGHT DIRECTORS DIDN'T WORK NOR DID SWITCHING TO APU GENERATOR. AFTER LANDING, IAS/MACH RETURNED TO NORMAL OPS. GROUNDED - YES. PERFORMED BITE LIBRARY TEST OF DFCS,(A1/A2) LIBRARY TEST #60.54 MCP SPEED SELECT. TEST PASSED. NO DEFECTS NOTED AT THIS TIME. TSR ISSUED. REF. MM 22-11-34. REMOVED/REPLACED DFCS MCP. OPS NML REF. SAME MM. PERFORMED ALSO #35 DFCS LRU INTERFACE TEST FOR MCP, #49 LAND VERIFY TEST AND HGS SENSOR TEST FOR FCC REF. SMM 34-36-00. A/C REMAINS CAT IIIA AUTOLAND AND HGS QUAL. STATUS SCREW SHOWS SAME.