As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
C HYD DEM PUMP LIGHT WITH GEAR RETRACT. ACCOMPLISHED FAULT ISOLATION PROCEDURE. ACP TROUBLESHOOTING IAW FIM. FAILED BLOCK 27 ON PAGE 173. WITH ADP IN AUTO AND CTR ELEC PUMPS OFF SHOULD HAVE MIN OF 2500 PSI WHILE OPERATING FLAPS FROM 5 THRU 30. HAD 1700 PSI. REPLACED ADP MODULATING VALVE. ALL OPS NORMAL.