"...and using enough of the basis  as a 179 deduction"

§179 is an election.  You can't just "use" it by restating the amount in your file (plus... that copy the client has doesn't show that, does it). 

Used to be that §179 election couldn't be done on an amended return, but I believe that changed.  But you need to research that.  AND what impact is there on the state (if there is a state return...CA §179 is limited to $ 25K).

Edit to add - AMEND !!