Per conversation with very nice Marriott rewards rep today. If you return a unwanted hotel cert under taken uncer a 713 award they will credit you back 50,000 reward pts. If you return the 2 10 awards under the award that takes 425,000 pts (can't rememeber the number) they will credit you back 106,000 points. The hotel certificates which are good for 1 year from date of issue cannot be renewed or extended since these awards are going away. The one good thing that they can now do is to credit the frequent flyer miles to a FF account # in someone else's name. THe rep I spoke to said that it costs $15.00 to do this because it involves a manual posting transaction but that will allow the Marriott points that we transfer to FF miles to be credited to my FF #'s at the airlines which already have mileage in them rather than having to open a entire new FF # in my husband's name. THe airlines will not let you combine mileage in 2 different FF # accounts for awards.