As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT WING REAR SPAR RIB AT WS 48.30 HAS CORROSION BELOW UPPER LIGHTING HOLE. ***AIRCRAFT REMOVED FROM SERVICE*** REMOVED CORROSION ON LH WING REAR SPAR AT WS 48.30 BELOW UPPER LIGHTING HOLE, MEASUREMENTS ARE 0.800"L X 0.700"W X 0.002"D. REMAINING THICKNESS IS 0.048". REPAIR WITHIN LIMITS REF ASAP ES# AWAC-CRJ257-01612 REV IR DATED 4/26/2021.