As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SETTING 1.5 EPR FOR ENGINE STABILIZATION AND PRIOR TO SETTING TAKEOFF THRUST, THE MASTER WARNING WITH ECAM GEAR NOT DOWN. TAKEOFF REJECTED WITH TWO MORE MASTER WARNINGS WITH THROTTLES AT IDLE, POSITION DET SYS 2. FOUND THE PROXIMITY SENSOR 81GB CLEARANCE OUT OF MM LIMITS. ADJUSTED THE CLEARANCE WITH SHIMS IAW MM 32-00-00-0401. OPS CHECKED GOOD IAW MM 32-61-00-0501.