What was found
SAL - FLT TA807 - BEFORE APPROACH, THE NR 1 VOR NEEDLE WENT DIRECTLY TO THE EAST AND WEST POSITIONS AND THEN THE NR 2 VOR REMAINED IN THE 'TO' POSITION AND THE NR 1 AUTOPILOT DID NOT CAPTURE ALTITUDE. THE AIRCRAFT RETURNED TO SAL STATION FOR MAINTENANCE. MAINTENANCE PERSONNEL PERFORMED TROUBLESHOOTING PROCEDURES AND FOUND THE NR 1 AND NR 2 VOR RECEIVERS FAULTY. REPLACED THE FAULTY RECEIVERS (S/N 2333 AND 1974) ACCORDING TO AMM 34-55-31. OPERATIONAL CHECK WAS PERFORMED, PER AMM 22-12-00 AND IT WAS WORKING NORMALLY. THE AIRCRAFT WAS RETURNED TO SERVICE. (M)