is there a way to efile the federal partnership extensions

No, you cannot e-file an Extension for a partnership, S-Corp, or C-Corp using TurboTax Business.

you would have to use a professional. kind of dumb of the IRS not to even have a website where a taxpayer could fill out an extension and submit it electronically.

See/read https://ttlc.intuit.com/community/forms/help/how-do-i-file-form-7004-application-for-automatic-extension-of-time-to-file-certain-business-income/00/25951

Must be postmarked before midnight tonight (march 15).