(7:40 p.m. EDT) -- An electrical issue on Celebrity Millennium is adversely affecting the ship's propulsion. The ship, currently on a Singapore-to-Hong Kong cruise, will be making some itinerary changes as it is forced to sail at a reduced speed until the problem is resolved.

According to an e-mail from Celebrity spokeswoman Cynthia Martinez, Millennium was originally scheduled to call in Hanoi (Halong Bay) on Tuesday, April 9, and finish the cruise in Hong Kong on April 11. Instead, the ship will spend both Tuesday and Wednesday at sea in order to arrive in Hong Kong as scheduled. Onboard engineers are currently working to fix the problem, and no modifications have been made to the next sailing.

Celebrity will provide each passenger with an onboard credit (determined by cabin category) "as a gesture of goodwill, and to thank guests for their understanding." Any unused credit at the end of the cruise will be refunded to the passengers.

Millennium departed Singapore on March 31 for an 11-night Asia cruise.

--by Erica Silverstein, Features Editor