The gearbox level plug is sealed from the factory with what appears to be red hermatite but is probably the grandson of red hermatite.
The coolant will be red OAT antifreeze, and I suspect that what you have here is the classic situation where the cold temperatures are causing a loosening of the hoses.
Give each of the Jubilee clip a quarter turn, and check the nylon T piece on the nearside bulkhead.
