9.6.1.   Normal Maintenance and Repair.
   A.   Nonconforming signs may be repaired or renovated as long as the cost of such work does not exceed, within a twelve-month period, 33% of the value of such . A permit for such renovation or repair is required. Proof of value is required at the time of permit.
   B.   The message of a nonconforming (sign face) may be changed, so long as a change in has not occurred. If a change in occurs, the must be brought into full conformity with this UDO.