As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO LIGHT OFF DURING ENGINE START ENGINE #1 WHEN USING RIGHT IGNITOR. ENGINE #1 STARTS NORMALLY USING LEFT IGNITOR. GROUNDED - YES. ALTERNATE DEACTIVATION PROCEDURES USED PER MPM CH5 TABLE 3 ITEM 7 REMOVED AND REPLACED #1 ENG R/H IGNITOR PLUG IAW B737-800 AMM 74-21-02. REVERSED CONFIGURATION CHANGES. IGN 1 LEAD PUT TO IGN 1 EXCITER BOX ETC. PERFORMED IGNITION SYSTEM AUDIBLE TEST IAW AMM 74-00-00. TEST GOOD.