What was found
(CAN) ON 100HR INSPECTION, FOUND OIL LEAK IN TAIL ROTOR GEARBOX FAIRINGS. AFTER REMOVING OUTPUT SEAL HOUSING, FOUND THE SPRING OF THE SEAL ON THE WEAR SLEEVE, AND WEAR SLEEVE WORN OVER 50 PERCENT THRU. AFTER CALLING REPS AND OTHER COMPANYS WE FOUND THAT THIS IS STARTING TO BE A RE-OCCURING PROBLEM. WE REPLACED THE SEAL AND WEAR SLEEVE, GROUND RUN THE HELICOPTER, AND CHECKED FOR LEAKS. NO LEAKS OR DEFECTS FOUND.