Determining Remaining SBA Borrowing Power

Does anyone have a suggestion for the best way to confirm the amount of SBA Borrowing Power or 'Dry Powder' I have available? I have access to the MYSBA portal and see the 7A loans that I'm a guarantor on as well as some of the searchfund investments I have made but as far as I can tell there is no way to get a 'you can borrow this much' figure. I have called the SBA hotlines and spoken to the regional offices and this question seemed to puzzle them.