As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING IN MSP THAT THEY SAW A PIECE OF METAL FLY OFF OF THE WING. AFTER INSPECTION ON THE GOUND IN MSP, THE FO FOUND THAT A PIECE OF METAL ON THE UNDERSIDE OF THE LEFT WING FLAP BEHIND THE ENGINE IS MISSING. REMOVED LH OUTBD LOWER FLAP REF 737 AMM 27-51, INSTALLED LH OUTBOARD AFT FLAP IAW B737 AMM 27-51-22.