As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4737 - CLIMBING THROUGHT 10,000 FEET, STARTED YAWING LEFT AND RIGHT APPROXIMATELY 2-4 DEGREES, BUT LEVELED OFF AT 19,000 FEET. CREW DECLARED AN EMERGENCY AND RETURNED TO ATL. MAINTENANCE REMOVED AND REPLACED THE RUDDER POSITION TRANSMITTER. OPERATIONAL CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE. (M)