As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE, THE CREW REPORTED RECEIVING AN AIR SPEED COMPARATOR ERROR, ALTIMETER COMPARATOR ERROR, FOLLOWED BY AN ADC 1 FAIL MESSAGE ON THE EICAS. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND WATER TO BE IN THE NR 1 PITOT SYSTEM. THE WATER WAS DRAINED FOLLOWED BY AN OPERATIONAL CHECK OF THE SYSTEM. NO DEFECTS NOTED.