Final answer:
If a minor defect in the fire protection system reported by an F-80 C of F holder is unresolved after three months, the holder must escalate the matter by reporting it to the local fire department or appropriate authority.
Step-by-step explanation:
As an F-80 C of F (Certificate of Fitness) holder, you have reported a minor defect in the fire protection system to the building owner, but it has not been addressed for three months. The next step you are required to take is to report the defect to the local fire department or other appropriate authority. This action ensures compliance with fire safety regulations and the wellbeing of the building's occupants. It's crucial to keep a record of all communications regarding the defect to demonstrate due diligence.