As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENG "COWL VALVE OPEN" LIGHT FLICKERED TO BRIGHT/DIM INTERMITTENTLY PRIOR TO DESCENT FROM FL370 (THE BLUE LIGHT). ACFT GROUNDED. R & R ENGINE COWL TAI VALVE IAW AMM 30-21-11. GROUND FUNCTIONAL TEST GOOD IAW AMM 30-21-710-801. NO HISTORY LAST 30 DAYS.