(a) A renegotiation occurs when an existing consumer rental-purchase agreement is satisfied and replaced by a new consumer rental-purchase agreement undertaken by the same lessor and lessee. A renegotiation is a new lease requiring new disclosures. However, the following events are not treated as renegotiations:

1. (1) The addition or return of property in a multiple-item agreement or the substitution of the leased property, if in either case the average payment allocable to a payment period is not changed by more than twenty-five percent.
2. (2) A deferral or extension of one or more periodic payments, or portions of a periodic payment.
3. (3) A reduction in charges in the agreement.
4. (4) A lease or agreement involved in a court proceeding.