As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 1819 -ATB- DUE TO MCP BUTTON STUCK AND AFDS UNABLE TO ARM VNAV. CONTACTED DISP AND MCC VIA ATL RADIO, AFTER DISCUSSING APPROACH REQUIREMENTS AT DESTINATION AND DIVERT AIRFIELDS, DECISION MADE TO AIR RETURN ATL. NO EMERGENCY DECLARED WITH ATC. CORRECTIVE ACTION: C/W OVERWEIGHT LANDING INSPECTION, R/R AFDS MODE CONTROL PANEL AND PERFORMED RETURN TO SERVICE TEST. LP 6534652