Need to top up gas and do maintenance but don't wanna kenna chop carrot head.
Depending on what kind of maintenance.
If you want to clean the blower wheel, which I'm now an expert after surveying 3/4 of Singapore, the jiuhu technicians expect you to do a "chemical overhaul".
You can forget about ALL the cheap servicing packages that do NOT include dismantling of the blower wheel. It's a half-fuck job that you can do better.
Chemical cleaning is not necessary, but dismantling of blower wheel is a MUST.
There is no need to top up gas. If you need to top up, that means somewhere in your system is leaking. You have to find the spot first.