What was found
FLT 4580 - DURING CLIMB-OUT FROM ATL-TOL, AFTER GEAR RETRACTION THE CREW RECEIVED PROXIMITY SYSTEM CAUTION AND PROXIMITY SYSTEM TWO FAULT STATUS MESSAGES. QRH PROCEDURES WERE COMPLIED WITH AND EMERGENCY VEHICLES WERE REQUESTED AS A PRECAUTION. THE AIRCRAFT RETURNED TO ATL AND LANDED SAFELY. MAINTENANCE REMOVED AND REPLACED THE PROXIMITY SENSOR ELECTRONIC UNIT (PSEU). OPS CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)