Letter states BX compact ttractor, GR ride on mower, ZD and ZG zero turn mowers.
It states my tractor model and serial number, model is BX2370DVA-AU.
The cap is AG18-57.
This could be an AU model only recall, I don't know as the letter is generated and sent to individual owners from the local database, there is no manufacturing date or model range eg; 60 series etc so they have singled out buyers who are affected, sorry I cannot offer any further info but I wonder if that part number is AU only as a lot of equipment arrives here with a different radiator that what the Euro market gets.
There is a picture of the faultly part and it looks like the blockage was always there and says that it may be clogged due to part of the injection moulding process.
I do not have a scanner (I am at work) so I can't send the letter.
It is the coolant reserve tank cap