As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AFTER ROTATION, CREW NOTICED THERE WAS DIFFERENTIAL PRESSURE READOUT. ONLY DASHES ARE DISPLAYED. CABIN ALTITUDE DID NOT EXCEED 1000FT. RETURNED TO DAL. CORR ACTION- MX RESET CPAM CB. DIFFERENTIAL PRESSURE INDICATION RETURNED TO NORMAL. PERFORMED PRESSURIZATION TEST WITH APU. OPS CHECK GOOD. NO INDICATION ISSUES FOUND.