As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE ON FLT 143 PUJ-BWI, THE LT AFT EMERGENCY WINDOW EXIT SHOWED ARMED ON ECAM (ABOVE FL 250). NO CHANGE IN CABIN ALTITUDE. ON GROUND, MAINTENANCE VERIFIED THAT THE PROX SENSOR AT THE LT AFT EMERGENCY EXIT HATCH ACCESS COVER TO BE OPERATIONAL IAW AMM 52-70-00-040-007. INDICATION OK AT THIS TIME. NO FAULT FOUND. AIRCRAFT RETURNED TO SERVICE.