What was found
STAB TRIM CHANNEL 2 WILL NOT ENGAGE. WITH STAB TRIM CHANNEL 1 ENGAGED, THE MACH TRIM WILL NOT ENGAGE. REMOVE AND REPLACE MOTOR CONTROL UNIT (MCU) HORIZONTAL STABILIZER TRIM ACTUATOR IAW 27-42-01. FOUND HORIZONTAL STABILIZER CONTROL UNIT (HSTCU) WET WITH WATER. REMOVE AND REPLACE HSTCU IAW 27-41-01. OPS CHECK GOOD. COMPLIED WITH OPS CHECK OF MACH TRIM IAW 27-35-25. OPS CHECK GOOD AT THIS TIME. MCU: P/N ON 7026-2, S/N ON 218, S/N OFF 328, HSTA: P/N ON 8396-3, S/N ON 281, S/N OFF 910, HSTCU: P/N ON 7060-8, P/N OFF 7060-7, S/N ON 174, S/N OFF 350.