One major difference between the FRBAR As is and the FRBAR Standard contract is that the standard requires all repairs to be done by a licensed professional, whereas the As-Is contract does not have such requirement.

Its a good idea to require the use of a licensed professional when preparing an addendum for the As Is Contract. You can use language such as this:

Seller Agrees to repair the __________ and seller agrees to use licensed professionals for all repairs and provide buyer with receipts, contracts and contact information of the licensed individuals making the repairs.