As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"AIR-GND DISAGREE" STATUS MESSAGE APPEARED AT/OR AFTER TAKEOFF. ACARS DISPLAYS AN "ON". BITE TEST OF PSEU FAULTING 015 CARD. CARD REPLACED ON 12-18. REPLACED LT REVERSER AIR GROUND SYS 1 RELAY K178 REF WDM 78-34-11. PSEU BIT AND VERIFY TESTS OK.