As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS THAT DURING TAXI OUT SMELLED AN ODOR (ELECTRIC) AND F/O OBSERVED FUMES COMING OUT OF HIS SIDESTICK PRIORITY PANEL. RETURNED TO THE GATE AND DEPLANED ALL PAXS. MAINTENANCE REPORTS PROBLEM CAUSED BY MCP. REMOVED AND REPLACED MCP (FCU) IAW AMM 22-81-12-401-001-A, PERFORMED SATISFACTORY OPERATIONAL CHECK IAW AMM 22-10-00-710-001-A. SYSTEM CHECKED NORMAL.