In 1005.11(d) it states in 1. that it should be a written explanation of the results of the investigation and that they can request the documentation. In 2.(i) It discusses debiting the provisional credit and notifying the customer of the amount and date and (ii) notifying the customer the bank will honor checks, drafts, etc....

My question is just the information in 1 required to be written or 1 and 2?

Both must be included in the written notification that no error occurred if provisional credit is being revoked.
If you resolve the investigation prior to providing provisional credit, then 2 would not be included since there is no provisional credit to be revoked.