As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE TAIL LIGHT AMBER WHEN ENGINE ANTI-ICE PUT ON AROUND 10000FT ON DESCENT, TURNED GREEN AROUND 2500FT AGL AND STAYED GREEN REST OF FLIGHT. ACFT GROUNDED. REPLACED NR 2 ENGINE TAIL COWL VALVE IAW AMM 30-21-11. ETOPS GROUND VERIFICATION TEST NORMAL IAW MM 30-21-11.