What was found
CAT IIIA HGS & AUTOLAND UNSUCCESFUL APPROACH WHEN AT 400' AGL AIRCRAFT TRACKING LEFT OF CENTERLINE. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 22-11 TASK 825 "AIRPLANE ALIGNMENT PROBLEMS DURING AUTOLAND APPROACH" FAULT ISOLATION, DFCS BITE LIBRARY TEST REF B737-900 AMM 22-11-00-740-806, DFCS LAND VERIFY TEST (GP 49) REF AMM 22-11-00-700-801 & HGS TEST REF HGS 4000 SMM 34-36-00, OPS CK NML. AIRCRAFT RELEASED FROM MEL 22-20B, MEL 22-99B & MEL 22-99C. AIRCRAFT LLM STATUS UPGRADED TO CAT3A AUTOLAND & HGS.