What was found
(CAN) FLIGHT CREW REPORTED FROZEN ELEVATOR TRIM IN DESCENT. AT 4,000 FT TRIM BEGAN TO MOVE AGAIN. ACFT LANDED WITH NO FURTHER FAULT. SYS INSPECTED WITH NO FAULTS FOUND. TRIM JACKS LUBRICATED. IT WAS NOTED THAT SINCE MFG REMOVED THE LOW UTILIZATION MAINTENANCE PROGRAM FROM THE MRP THE LUBRICATION FREQUENCY HAS ESCALATED FROM 18 MONTHS TO 5,000 HRS/60 MONTHS. RE TASK 2730/04 THE LAST TIME THE ELEVATOR TRIM SCREW JACKS WERE LUBRICATED WAS DEC. 2012, 38 MONTHS AND 2,700 HRS PREVIOUS.