Mitsubishi aircon service annually or as per the manufacturer’s guidelines. A trained technician can perform tasks such as cleaning the condenser coils, checking refrigerant levels,....
https://surecool.com.sg/2023/06/16/common-problems-in-mitsubishi-air-conditioners-and-how-to-fix/

aircon service guide look like in 2023? So here We can make some guesses and suggestions about what aircon service may look like in 2023.....
https://surecool.com.sg/2022/11/26/step-by-step-aircon-service-guide/