Limited availability of parts too. Mine has developed an oil weep from one of the output shafts, and I began to investigate what fitting new seals would entail. Didn’t look like any fun at all, and parts tricky to source. Jaguar classic didn’t have all of the necessary bits, which is never a good sign. I spoke with my technician contact at the local dealer, who has been very helpful in the past. His advice was to make sure the breather was clean and then cross my fingers! If it still weeps, let it weep, and top up occasionally. DO NOT TAKE IT APART he said,
my fingers are currently crossed, and I am on the lookout for a source for reconditioned units in case the need arises.