As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT DECK HAD A WHEEL WELL FIRE INDICATION AT FLIGHT LEVEL 260. THE CREW EXTENDED THE GEAR AND THE INDICATION WENT OFF. THE AIRPLANE WAS REMOVED FROM SERVICE (GROUNDED) AND THE LEFT AND RIGHT MAIN LANDING GEAR WHEEL WELLS WERE INSPECTED WITH NO DEFECTS FOUND. THE WHEEL WELL FIRE CIRCUIT CARD M691 WAS REPLACED. THE CAUSE OF THE FIRE INDICATION IS UNKNOWN.