As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT ISLE FIRST CLASS EMERGENCY LIGHTS FLICKER ON DURING TEST PROCEDURE. RECEIVED AND INSTALLED HARNESS REF ITEM NR 3 IN E-58 9647327. REMOVED AND REPLACED EPL HARNESS MPN 1060259-001 IAW AMM 25-25-11. OPS CHECKED NORMAL. THE AIRCRAFT WAS GROUNDED.