As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST NR 1 ADC DURING CLIMBOUT AT APPROXIMATELY 2000 FEET. DUMPED FUEL TO SAFE LANDING WEIGHT AND RETURNED TO FIELD FOR SAFE LANDING. REPLACED NR 1 ADC IAW AMM 34-12-34, PAGE 401. SYSTEM TEST NORMAL PER AMM 34-11-20, PAGE 501. AIRCRAFT RETURNED TO SERVICE.