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 SUSPECT CRACK FOUND ON LH WING SPAR 1 FITTING AT WINGLET ATTACHMENT. REPLACED SPAR 1 FITTING PN 170-31107-051 IAW SRM 51-43-03, 51-43-04. SEE AAR NRC# 4500907-5000-0051 FOR WORK PERFORMED. AC WAS RTS. MAJOR