What was found
AIRCRAFT WAS LEVEL EN ROUTE AT FL 410 WHEN CREW RECEIVED AN AMBER E IMMEDIATELY FOLLOWED BY A RED E ON THE PDF'S. PERFORMED EMER CHECKLIST. THE ELEVATOR TRIM WAS STICKING & NOT GETTING FULL RANGE OF MOTION & GETTING STUCK. DECLARED AN EMER & DIVERTED. SUSPECTED WATER IN GREASE AT THE TRIM ACTUATOR. LUBED ACTUATOR IAW AMM CHP 12-21-01 & NOTICED WATER BEING PUSHED OUT. CONTINUED GREASING UNTIL NO MORE WATER EXITING. PLACED ACFT BACK IN SERVICE, NO FURTHER REPORTS OF FREEZING TRIM TAB ACTUATOR SINCE GREASING.