What was found
INVESTIGATED REPORT OF RT (COPILOT'S) SIDE PITCH TRIM FAIL INDICATION. ALSO SHOWING RED "X" INDICATIONS FOR AIRSPEED, ALTITUDE, AND VERTICAL SPEED. ALTITUDE PRESELECT TURNS RED, THEN BLUE. REPLACED NR 2 AIR DATA COMPUTER WITH AN O/H UNIT, DISPLAY INDICATIONS NORMAL. RECOMMEND MFG SERVICE FACILITY INVESTIGATE AT TEAR-DOWN TO DETERMINE IF INTERNAL COMPONENT FAILURE OR WATER CONTAMINATION. SB 34-3972, MODIFICATION OF NR 2 AIR DATA COMPUTER PLUMBING, WAS PREVIOUSLY COMPLIED WITH.