What was found
(CAN) TWICE WITHIN A 20 HOUR PERIOD,THE YELLOW TEMP INDICATERS CHANGED COLOUR, AND GREASE WAS LEAKING FROM THE FWD. END OF THE DRIVE SHAFT. THE SHAFT WAS REPLACED AND NO FURTHER PROBLEMS HAVE BEEN REPORTED.THE SPHERICAL COUPLING WAS REPLACED ON THE PROBLEM SHAFT,AND WAS INSTALLED ON ANOTHER HELICOPTER, WITHOUT AND REOCCURENCE.