What was found
12 MIN AFTER T/D LEVEL AT FL230 THE LEFT ENG BLEED OFF LIGHT CAME ON, AS WELL AS THE L CENTER FUEL PUMP PRESSURE LIGHT AS WELL AS 0 ON THE N3 INDICATOR AND ZERO ON STDBY N3 INDICATOR. REMOVED AND REPLACED N3 (HP) TACHOMETER TRANSMITTER AT NR 1 ENG PER AMM 77-12-02-404. LEAK TEST GOOD. OPS CHECK PER AMM 77-12-0 0-715 OK. ALL PARAMETERS MATCHES. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1492008 SN OFF 01442 SENSOR, SPEED, OFF 19-7712-9-9001 1442 ON 19-7712-9-9001 6556.