My perentie RFSV has a leak at the the top cover plate of the PAS box- i assume there is a seal/o-ring under there that i can replace in situ-don't really want to have to to pull the whole thing out to replace one seal. BTW-is it possible to get just that seal/o-ring or do i need to buy a kit? Looking thru my army service record book the PAS box was replaced only 5000km ago - incredibly they've replaced it about 3 times it's only done 60,000kms - it must get a real workout especially with those split rims that weigh a tonne.