Revising of Depreciation expense account

Hi,

For a certain group of Assets, the depreciation expense account were mapped incorrectly.  We have run depreciation and almost we are in end of the Year. we need to correct now.....

1. How do I transfer the amount from incorrect expense to correct expense account.  Should we have to do it thru manual JE.
2. How do I change the expense account for those selected assets?

Thanks

Vidhya