As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT1840 - SHORTLY AFTER TAKEOFF, AT APPROXIMATELY 400 FEET, THE FIRST OFFICERS AIRSPEED INDICATOR AND ALTIMETER BECAME UNRELIABLE. CAPTAINS SIDE WAS OPERATIONAL ALONG WITH THE STANDBY INSTRUMENTS. FLIGHT RETURNED TO FIELD AT IAH AND LANDED WITHOUT FURTHER INCIDENT. (M)