As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
C ADP LOW PRESS LIGHT ILLUMINATED IN AUTO. EICAS MSG DISPLAYED C HYD DEM PUMP. ADP PRESS IS NORMAL. FRM CODE 29-11-54-00. CREW COMMENTS: C HYD DEM PUMP EICAS & PRESS LT ON AFTER TAKEOFF. STAYED ON AFTER SW SELECTED TO ON. MAINT TEXT: REPLACED S28 PSI SWITCH AT CENTER HYD MODULE & TRIED ADP RESET, NO HELP. REPLACED ADP, OPS CHECK GOOD.