As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3870 -ATO- DISCONTINUED TAKE OFF IN MSP AT APPROXIMATELY 50KTS DUE TO MASTER CAUTION LIGHT WITH NO ASSOCIATED FAULTS. CORRECTIVE ACTION: FOUND FAULT 31-53010 ON PROXIMITY SWITCH ELECTRONICS UNIT. REPLACED FLAP/SLAT ELECTRONIC UNIT PER B737 FIM AND OPS CHECK GOOD. (LP 0637970)