What was found
FLT 705 - FLL-PID - PILOT ABORTED AND RETURNED TO THE GATE. PILOT REPORTED NR 3 OIL PRESSURE GAUGE ERRATIC READING 80-150 PSI. AIRCRAFT DEPLANED 35 PASSENGERS AND TAXIED TO MX HANGAR. UPON ARRIVAL AT HANGAR THE NR 3 OIL PRESSURE TRANSMITTER WAS CHANGED. DID NOT FIX PROBLEM. SUBSEQUENTLY, THE NR 3 ENGINE OIL PRESSURE REGULATOR WAS CHANGED IAW PW MM 79-25-04. THE ENGINE WAS GROUND RUN AND NO FURTHER OIL PRESSURE PROBLEMS WERE NOTED. AIRCRAFT RETURNED TO SERVICE. (M)