ATPL - To fight a fire in an air-conditioned cargo hold:

Question id 220 - Operational Procedures - ATPL - Airline Transport Pilot license

Extinguish fire only.

Extinguish fire and reduce air conditioning.

Fire-fighting is not necessary, since the transport of combustible goods in an air-conditioned cargo hold is forbidden.

You turn off the cargo hold ventilation and extinguish fire.