No don't amend since the IRS already corrected your return and you paid the tax due. Or until you figure out what other income the IRS changed or you left out. I would double check all your 1099R forms, that they are on the right line 4 or 5 and you got the right taxable amount on 4b and 5b.
No, Turbo Tax has not been making any calculation errors on SS.
