As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCOMPLISHMENT OF PCI 552 (RR NR RB72-9660 R9), FAN BLADE TAP TEST, BLADE AT POSITION 13 FAILED THE TAP TEST. IT WAS FOUND TO BE CRACKED APPROXIMATELY SEVEN INCHES IN LENGTH ON THE BACK SIDE AT MID-SPAN. MAINTENANCE REPLACED THE FAN BLADE.