As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER BLOCK OUT WITH BOTH ENGINES RUNNING AND FLAPS EXTENDED EICAS MESSAGE APPEARED CENTER 1 PRIMARY PUMP ALSO PRESSURE LIGHT ON C1 PUMP. AIRCRAFT RETURNED TO BLOCKS (BTB). DEFERRED SYSTEM IAW MEL C ABX-29-31-2-1. PERFORMED OPS CHECK OF C1 AND C2 HYD SYSTEM IAW AMM 29-11-00. OPS CHECK GOOD. SWAPPED PRESSURE SWITCHES IN PRECAUTION IAW AMM 29-11-09. OPS CHECK GOOD. NO LEAKS DETECTED. THIS CLEARS DI 29849. PLACARDS REMOVED. AIRCRAFT RETURNED TO SERVICE.