As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LIFT OFF, MAIN WHEELS ALL TEST LIGHTS FRONT PANEL ILLUMINATED. ENGINE OPERATION AND GENERATORS NORMAL. RETURN TO DEN. T/S FOUND A .25 INCH NUT JAMMED ONTO WIRES FOR L/E GREEN LIGHTS ON FWD PANEL. REMOVED NUT, ALL WARNING LIGHTS TESTED GOOD PER M/M 33-150.