As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT-ORD - FLT 909 - AFTER SELECTING HYDRAULIC PUMPS ON HIGH, RIGHT PRESSURE GAUGE STARTED TO OSCILLATE AND THEN WETN TO ZERO. QRH PROCEDURES WERE IMPLEMENTED AND FLIGTH LANDED WITHOUT INCIDENT. AIRCRAFT WAS TOWED TO THE GATE. MAINTENANCE REPLACED THE ELECTRICA DRIVEN AUXILIARY HYDRAULIC PUMP IN THE RIGHT WHEEL WELL. LEAK AND OPERATIONAL CHECKS GOOD. (M)