As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RUN UP, HYDRAULIC TEST SWITCH "S-2 AND HOLD" DOES NOT FUNCTION. TEST FLIGHT MOC CONFIRMS HYDRAULICS CHECK S2 DOES NOT WORK. WHEN HYDRAULICS TEST SWITCH IS PLACED INTO THE S2 TEST LOCATION, HYDRAULICS ON SYSTEM #1 DOES NOT REDUCE TO AT OR NEAR 0. MAINTENANCE REPLACED HYDRAULIC TEST SWITCH IAW TM 29-30-00, 8-3.