Customer requested that we do the annual fire extinguisher inspection and the semi-annual fire suppression inspection. We went in and located all the fire extinguishers, decided the process that needed to be done on each fire extinguisher and completed that service. One Fire extinguisher needed to be hydrotested, got that extinguisher up to date. Then went on do the service and maintenance on the fire suppression system (Range Guard). I changed out the fusible links and tested the system. The filters need to be cleaned as soon as possible. Recommendation: To get your kitchen exhaust system & fan cleaned as soon as possible.