What was found
INSPECTION TYPE: NA DIVERSION, NO EMERGENCY DECLARED. AT 400' ON ILS APPROACH RUNWAY 14 JAX THE FOLLOWING OCCURED. AP DISENGAGED FLIGHT DIRECTOR G/S DEVIATION BAR DISAPPEARED G/S FLAG APPEARED FOR BOTH CAPT & F/O. PERFORMED ILS CHECK, IAW FIM 34-31-00-815-802 SYSTEM CHECKS OK. NO HISTORY, COULDNT DUPLICATE. PERFORMED AUTO FLIGHT FAULT BITE PROCEDURE, IAW FIM 22-02-00-810-801-001 LEAD ME TO FAULT TREE 837 22-02. SYSTEM IS OK, PER FIM 22-02-00-815-837 MESSAGE ILS BEAM ERR. SYSTEM CHECK'S OK, RETURN TO SERVICE.