So the Diamond line says you have the same redeposit rules as all other SkyMiles awards.

But Delta on twitter i.e. [MENTION=12946]Delta[/MENTION] says no the same rules as cash E Basic fares so no redeposit after 24 hours.

I have an email in to Delta CORP COM and will update when I get word!

UPDATE: From Delta Corp: Basic Economy Awards, like all tickets, are refundable during the Risk-Free Cancellation period. Beyond that timeframe, Basic Economy fares are not eligible for changes or cancelations (including redeposit fee waivers for Platinum and Diamond Medallions).