You might start with the easiest way:

"Business entities can request their transcripts using form 4506-T by faxing or mailing the form to the appropriate number or location indicated on the form’s instructions. Faxing is generally the quicker method to obtain the transcripts. If you mail the form, you may want to
consider sending it via certified mail with a return receipt requested.

Business entities may also try calling 1-800-829-1040. Some business entities have been
successful at getting transcripts faxed to them the same day."

Otherwise:

https://www.irs.gov/individuals/get-transcript-faqs

https://www.irs.gov/pub/irs-pdf/f4506t.pdf