As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL IMBALANCE CAUTION MSG IN FLIGHT, NO READOUT ON LEFT TANK AFTER MSG. / REMOVED AND REPLACED THE LH #4 FUEL GAUGING PROBE IAW CRJ900 AMM 28-41-09-000/400-801. COMPLETED FUELING OPS CHECKS AND LEAK CHECK IAW CRJ900 AMM 28-41-09-400-801. OPS CHECKS GOOD, LEAK CHECK GOOD. NO DEFECTS NOTED AT THIS TIME.