What was found
MIA FLT 1182 EN-ROUTE GUA - MIA. THE AIRCRAFT WAS NOT GROUNDED. AROUND 1500 SHORT FINAL RUNWAY 9 MIA, AUTOPILOT ENGAGED, APP MODE ENGAGED. ON LOC AND GS, AIRCRAFT INITIATED A CLIMBING LEFT TURN. FLIGHT DIRECTORS REMAINED CENTERED, GO AROUND INITIATED. SECOND APPROACH HAND FLYING, HEADING SELECT WITH APP ARMED FLIGHT DIRECTORS FAILED TO CAPTURE LOCALIZER. LOC CDI FLUCTUATED LEFT AND RIGHT FULL SCALE FROM 700 DOWN. MAINTENANCE ACCOMPLISHED FLIGHT FAULT REVIEW AND FOUND NO FAULTS. ACCOMPLISHED BITE OF HGS AND FOUND ILS/LOC/COMP FAULT. AS A PRECAUTION RESET LEFT AND RIGHT MMRS IAW AMM 34-58-00 AND ACCOMPLISHED OPS CK OF ILS SYSTEM IAW AMM 34-31-00. OPS CK OK.