As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, MAIN CARGO DOOR SILL"L" LOCK SPRING BROKEN. 2ND FROM AFT TO FWD. P/N 57963-101 AT STA 588 LBL 88.50. POSITION A3L RESTRICTED TO 6595 LBS. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE DEFERRED IAW ABX-25-58-1A AND RETURNED AIRCRAFT TO SERVICE.