From NFPA 25, 2008 edition which is the NFPA standard for changing sprinklers.
4.1.4.1* Corrections and repairs shall be performed by qualified maintenance personnel or a qualified contractor.
3.3.28 Qualified. A competent and capable person or company
that has met the requirements and training for a given
field acceptable to the AHJ.
So call your AHJ, see below who that maybe.
3.2.2* Authority Having Jurisdiction (AHJ). An organization,
office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure.
A.3.2.2 Authority Having Jurisdiction (AHJ). The phrase “authority having jurisdiction,” or its acronym AHJ, is used in NFPA documents in a broad manner, since jurisdictions and approval agencies vary, as do their responsibilities. Where public safety is primary, the authority having jurisdiction may be a federal, state, local, or other regional department or individual such as a firechief; fire marshal; chief of a fire prevention bureau, labor department, or health department; building official; electrical inspector;or others having statutory authority. For insurance purposes, an insurance inspection department, rating bureau, or other insurance company representative may be the authority having jurisdiction. In many circumstances, the property owner or his or her designated agent assumes the role of the authority having jurisdiction; at government installations, the commanding
officer or departmental official may be the authority having
jurisdiction
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