As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DIS-DURING CLIMB OUT CREW NOTED CAPT/FO ALT GO BLANK. CREW ELECTED TO RETURN TO AIRPORT. NOTE ON THEWAY TO AIRPORT SYSTEM CAME BACK ON LINE. CREW CONTINUED TO AIRPORT TO HAVE MTX CHECK OUT SYSTEM. A/C LANDED SAFELY NO FURTHER INCIDENTS WERE REPORTED. FOUND NR 1 ADC COMPUTER INTERNAL FAILURE. RAI'D THE NO.1 ADC AND OPS CHECK GOOD.