My Name is Glen Craven, I run a small bus company in NZ. in 2009 i purchased a BCI PK6930A. Since purchasing the bus the Rear Axle Diff has become noiser and at every service we are finding metal flakes in the oil change. The Local agent has deined any warranty on the diff. the axle has only done 136,000 kilometres.Please give me a price for a new Diff head.Axle code 24FS09E, Customer Code PK6930A1-24000010K, MFG 070929/3Rating 5.13Thank you!