2008 Volvo VHD64 FT400

Been thinking about looking a VHD axle forward,in particular this one.
https://www.truckpaper.com/listings/trucks/for-sale/203912689/2008-volvo-vhd64ft400
Volvo D13 engine-485 HP
Eaton-Fuller 18-speed manual (very rare,Volvo doesn’t make them like that anymore-as of 2022 all VHD trucks come equipped with the I-Shift transmission,with or without crawler gears as an option).
3.91 gears
637,647 miles(a lot of miles but spread out over 14 years)
14,600 lb rated steer axle
46,000 lb rated drive axles
What are some key maintenance items or other issues one should look out for on a VHD of this vintage? Any info would be appreciated!