As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER TAKEOFF FIRST OFFICER FLIGHT DIRECTOR WORKED INTERMITTENTLY, MACH TRIM FAIL AND SPEED TRIM FAIL ILLUMINATED. EMERGENCY DECLARED. FLIGHT DIVERTED TO ORD LANDING SAFELY. MAINTENANCE TROUBLESHOOT MACH TRIM FAIL AND SPEED TRIM FAIL TO A FAULTY ELEVATOR POSITION TRANSMITTER. REPLACED TRANSMITTER PER AMM 22-11-30. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK. NO FURTHER FAULTS.