As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKE-OFF AND ENGINE START, LEFT ENG DID NOT DISPLAY N1 IDICATION. AIRCRAFT ABORTED TAKE-OFF. (ATO). REMOVED AND REPLACED LT ENG N1 SPEED SHAFT SENSOR IAW B767 AMM 77-12-01, NO HELP. PERFORMED T/S PER WDM 77-12-11. FOUND CONNECTOR D4224P UNSECURED. RE-SECURED PLUG IAW SWPM 20-60-00. OPS CHECKED GOOD IAW 77-12-01. AIRCRAFT RETURNED TO SERVICE.