(should have documented, dates may not be exact) What made you interested in investing in this type of deal?

There are situations where it is more beneficial to end the current lease and start a new one (ability to change lease terms, rent amount etc), and there are situations where it makes more sense to just do an addendum.

Are you researching this yourself or asking your borrower to provide documentation to support this?

I currently have $350 dollars that is missing from a chargeback reversal from a tenant that has a document case with Amex and a statement to prove the money was sent back to me. 

If it’s verbal, they’ll need to document any prior communication or payment records to establish the relationship.If the PM is completely unresponsive, they may want to send a formal written demand for communication and payments via certified mail.

Also consider all lenders will require to review your insurance when underwriting a loan and it's likely a violation of your existing loan documents to let the properties go uninsured even if they didn't require insurance escrows. 

HELOC: A cash-out refinance could be more beneficial if you're looking for a lump sum to purchase the new property outright, particularly because interest rates may be lower than a HELOC.

For various reasons, the US government wants to understand the "beneficial ownership" of certain businesses.

I know the process from beginning to end and documented this thoroughly.

If I read through your comments, it sounds as if a "life coach/mentor" would be more beneficial for you rather than a wholesaling mentor.