As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PUSH BACK C HYD PRES EICAS MSG AND CENTER HYD DISCRETE LIGHT ILLUMINATED AC RETURNED TO GATE AND MTX GROUNDED AC TROUBLE SHOT FOUND CENTER HYD PRESSURE SITCH FAULTY R/R CENTER HYD PRESS SWITCH S35 REF AMM 29-11-09. OPS CHECK LK CHECK OK. AND RETURNED AC TO SERVICE