As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ADC FAILURE WITH CORRESPONDING UNRELIABLE AIRSPEED INDICATION AND MULTIPLE EICAS MESSAGES. AIR RETURN TO ATL. R/R #1 ADC IAW CRJ 700 AMM 34-13-01. OPS TEST GOOD, LEAK TEST GOOD. PN OFF/ 822-0472-636, SN OFF/ 24GFK, PN ON /822-0372-436, SN ON/ 10HLG