What was found
SHORTLY AFTER TAKEOFF, THE CREW DECLARED AN EMERGENCY DUE TO THE SMELL OF SMOKE ACCOMPANIED BY WITH THE LIGHT RESEMBLANCE OF SMOKE IN THE COCKPIT. THE CREW MADE AN AIR-TURN-BACK. MECHANIC REPLACED THE GPS-300 FLIGHT DIRECTOR AND AUTO PILOT CONTROL PANEL. OPERATIONAL CHECK REVEALED THE AUTO PILOT NOW DID NOT WORK WITH THE NEW PANEL. THE AUTO PILOT FUNCTION WAS MELED. ON 01/23/05 THE MEL WAS CLEARED BY REPLACING THE GPS-300 PANEL AGAIN. WITH NO FURTHER DISCREPANCIES NOTED THE AC WAS RETURNED TO SERVICE. (K)