I have a template which states the obvious "I've prepared John Doe's return according to information provided and in accordance with my due diligence...etc." And a further insert when the lender wants that risk-sharing statement (is there any other purpose?) that I verify taking money out of the business won't harm....to which I supply a contrary statement, that it's the bank's responsibility not mine.
Never had a client come back and say the letter was insufficient, IMO seems the loan processor is only concerned with checking the boxes so I wonder if they even read the letter!