As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY 20 MINUTES FROM PHL, THE CREW RECEIVED A FUEL IMBALANCE INDICATION. THE CREW FOLLOWED THE QUICK REFERENCE HANDBOOK AND SHUTDOWN THE LEFT HAND ENGINE AND LANDED AT PHL. MECHANICS WERE SENT FROM DAY. MAINTENANCE THEN INSPECTED AND REPLACED THE APU PUMP IN ACCORDANCE WITH BOMBARDIER AIRCRAFT MAINTENANCE MANUAL 28-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.