As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF ON FLIGHT 3414, CREW REPORTED THE CAPT EFIS DISPLAYS WENT BLANK. AIR RETURN TO MEM. MAINTENANCE REMOVED AND REPLACED NR 2 SYMBOL GENERATOR P/N 4066300-911, S/N ON 94090418, S/N OFF 92030294, OP CHECKS GOOD IAW AMM 34-27-17.