Below is a collection of frequently asked questions about fire extinguishers and servicing
All Fire Extinguishers are required to have yearly maintaince by a service professional to make sure it's still safe and keep it up to date. Most extinguishers need service every 6 years to be taken apart, checked inside and out, and then recharged. If your extinguisher gauge is not in the green, no matter when the last service was done, it needs to be taken in for service to have that problem fixed.
If the needle is still within the green section of the gauge it is ok. If however it has crept in to the red then the extinguisher needs attention immediately.
Yes the pin would need replacing as is could jam in an emergency. It can be replaced by breaking the tamper seal, removing the old pin, inserting a new pin and replacing the tamper seal. This should be performed by a service professional.