Open the front and rear doors to failure, lubricate the flat rods of the door opening limiters on both sides with USSA grease.
With the fuel tank filler hatch open, lubricate the rubbing surfaces of the hinge and the cover spring with Litol-24 grease.
Lubricate the lock larvae through the keyholes of the doors with VTV-1 auto-lubricant in an aerosol package. If there is a lock in the fuel tank filler cap, lubricate the lock cylinder with the same grease.