What was found
AT FL240 THE PITCH TRIM WAS JAMMED AT THE 0* SETTING & THE CONTROLS REQUIRED A NOTICEABLE BUT NOT EXCESSIVE AMOUNT OF FWD PRESS TO MAINTAIN LEVEL FLIGHT. CREW LEFT THE PITCH TRIM IN CURRENT POSITION & LANDED WITHOUT INCIDENT. THE ELEC PITCH TRIM WAS PREVIOUSLY DEFERRED & CURRENTLY ON MEL. PURGED ALL THE OLD GREASE WITH NEW FROM BOTH PITCH TRIM ACTUATORS. PITCH TRIM GND OPERATIONAL CHECKS WERE GOOD. A SUCCESSFUL OPERATIONAL CHECK WAS PERFORMED. ACFT WAS RTS.