The heatherland fires have not spawned for a couple months for me I am starting to think the mission is bugged (yes I have mutiple of the POIS)
The University Hall fires arent spawning either I am sure I have the required stations as I have: 31 fire stations 34 ambulance 27 police stations 12 hospitals 2 Hems 1 NPas and a hart base so I think I beat the requirements.