As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING TC8420000 - FOUND ALTERNATOR PLUGS DP802 AND DP0702 LOOSE BOOT PLU. J8 AND J7 HARNESS REQ. REPLACEMENT ON #1 ENGINE. GROUNDED - YES. RMVD AND INSTALLED 1EACH J8 AND J7 ENGINE HARNESS. REF B737-800 AMM 73-21-06. PERFORMED #1 ENG EEC, AMM TASK 73-21-00 ACTUATORS TEST TASK 71-00-00 ALL TESTS PASSED.