What was found
OST FMS 1, FMS 2, COMM 1, NAV 1, FLIGHT DIRECTOR, AUTO PILOT, GPWS, WX RADAR, RADAR ALTIMETER AND HAD A FLASHING AOA WHEN WE ENCOUNTERED MODERATE TURBULENCE AT FL 400 AND .75 MACH. POWERED THE AIRPLANE DOWN ON LANDING AND NOW EVERYTHING WORKS AFTER POWERING THE APU BACK UP. INSPECTED SYSTEM, NO FAULTS FOUND. APPLIED POWER TO ACFT AND OPS CHECKED ALL AFFECTED SYS. FOUND AFFECTED SYS TO OPERATE NORMALLY AT THIS TIME. NO DEFECTS FOUND, SYS CHECK GOOD AT THIS TIME. IAW HS125 800XPC MM 24-50-00, 34-60-05, 34-40-05, 22-10-00 AND 23-80-15