What was found
(CAN) TRIM WAS STUCK IN NOSE UP. TRIM INDICATOR WAS NOT SHOWING FULL UP (ONE LIGHT FROM FULL UP IND), WHEN TRIM WAS SELECTED BY EITHER TRIM SWITCHES THERE WAS NO RESPONSE. FOLLOWING MFG EMER PROCEDURES CHECK CB, (IN) AS THE TRIM MOVED TO FULL UP INDICATION AND WOULD NO LONGER MOVE. EMER PROCEDURES INDICATE THAT HIGHER FORCES CAN BE EXPECTED AND TO LAND AT NEAREST SUITABLE AIRPORT. STUCK TRIM DID NOT PREVENT FULL DEFLECTION OF ELEVATOR CONTROL OTHER THAN HIGHER FORCES REQUIRED. AFTER SEVERAL HOURS IT WAS PINNED DOWN THAT TRIM SWITCHES WERE WIRED THROUGH TWO RELAYS. FOUND THAT DOWN RELAY WOULD STICK WHEN TRIM WAS SELECTED IN FULL UP POSITION. REPLACED BOTH RELAYS AND THEN UNABLE TO FAIL SYS.