As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, EICAS CAUTION L HYD SYS PRESS ILLUMINATED. SELECTED DEMAND PUMP TO ON. LIGHT REMAINED ILLUMINATED. ON ARRIVAL LIGHT EXTINGUISHED. VERIFY LT PUMP WORKS BOTH IN AUTO AND IN ON. SUSPECT INTERMITTENT PRESS SWITCH. FWD TO MCO AND PLAC PER MEL 29-31-01A. ACTIVATED FLT CONTROLS PRESSURE CHKS OK. PTU SIGNAL WIRE HAS BEEN DISCONNECTED AND MUST BE RECONNECTED BEFORE MCO IS CLEARED.