As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 4,000 HOUR CHECK, CRACKS IN FLAP REAR SPAR AND LOWER SKIN AT WS 142 LT AND RT FLAPS. MAINTENANCE COMPLETED EO NR S57007. STOP DRILLED THE CRACKS IN BOTH END IN ACCORDANCE TO CH 51-70-03 AND SEALED STOP HOLES. INSTALLED A DOUBLER PLATE AND SHIMMED. SURFACE TREATED. INSTALLED NEW FASTENERS ACCORDING TO THE SP 51-40-21.