As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4588 PIT-IPT. DURING CLIMB OUT AND DESCENT FLIGHT CREW NOTICED THAT THE MAIN ELEVATOR WARNING LIGHT WAS ILLUMINATED. THE CREW FOLLOWED THE QRH AND DISCONNECTED THE AUTO-PILOT, THEY THEN NOTICED THAT THE MAIN ELEVATOR TRIM WAS INOPERATIVE AND NOT TRIMMING AT ALL. A/C RETURNED TO PIT AND TAKEN OUT OF SERVICE AT 1735(LT)