Petrol, Oil, Water, Electrics (I think was originally electrolyte when you had to top the batteries up!) & Rubber!
I amended ours to 'Flower' checks when they went over to diesel:
Fuel, Litter, Oil, Water, Electrics & Rubber
...And then of course the 'Eagle' winch equipment check list:
FFAAGG..
OC 613 (Jacko) was very hot on ensuring the winch was left in the coirrect state; he would ask 'if you checked the oil level one morning and discovered it was excessive, what would you do?'
Well the 2 drum winch had gravity petrol feed to the engine and if you left the fuel cock on overnight, you risked having petrol seep into the engine thus increasing the oil level.