47 CFR §74.852

1. (a)The licensee of a low power auxiliary station may make any changes in the equipment that are deemed desirable or necessary, including replacement with certificated equipment, without prior Commission approval: Provided, The proposed changes will not depart from any of the terms of the station authorization or the Commission's technical rules governing this service: And provided further, That any changes made to certificated transmitted equipment shall be in compliance with the provisions of part 2 of the Commission's rules and regulations concerning modification of certificated equipment.
2. (b)Any equipment changes made pursuant to paragraph (a) of this section shall be set forth in the next application for renewal of license.