As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN ALTIMETER OFF FLAG APPEARED DURING TAXI. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE REMOVED AND RESEATED CAPT ALTIMETER CANNON PLUG OPS NORMAL OF CAPT ALTIMETER PER B767 AMM 34-13-01 NO DEFECTS AC IS RVSM COMPLIANT. AIRCRAFT RETURNED TO SERVICE.