As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN FOR HVY CK FOUND LT WINGLET FRONT SPAR CRACKED AT LOWER ATTACHMENT. MX REMOVED AND REPLACED LT WINGTIP PN 171-16240-407 IAW AMM 57-30-00. SEE NRC # 4000515-5000-0005 FOR WORK PERFORMED. AC REMAINS IN YRQ FOR COMPLETION.