100% u kena con by technician. gas should already be inside compressor. and gas leaking very2 rare, even 10 years old aircon wont have gas leak. when technician come service aircon say need to topup gas, most of them are bullshitting, just wana charge u extra. if gas leak on aircon, u need to seal the leaking copper by brazing it.

but many years ago when im still noob about aircon I also got conned. they charged me 200++ for changing capacitor on air cond compressor. the capacitor u can buy for rm20 only.

nowadays i just maintain and clean my aircon myself. save rm100++ every 6 months by servicing aircon on my own.