NYC Fire Extinguisher Maintenance & Repair After you have done everything you’re supposed to do, such as inspect and maintain your fire extinguisher, it may be time for some routine repair. Do NOT try and repair your fire extinguisher yourself. In time, all things need some fine tuning or repair. In this case, it is best for you to call one of the professional service engineers at M&M Fire Extinguishers. We will take a look at your extinguisher and ascertain whether or not it just needs some maintenance, repair, or replacement. Please call us today to arrange a consultation!