When refiguring depreciation for line 17 on form 6251 (from 200%db to 150%db) does one refigure all previous year's depreciations included on line 17 of the 4562, and does one refigure depreciation on listed property, from line 21 of the 4562? Then, does one add those amounts to the refigured depreciation from line 19 of the 4562?

I spoke with 9 people at the irs, and no one could answer my question, until finally an agent told me they aren't allowed to answer AMT questions because they're too complicated!!