dont know where to get it serviced in vic im sure someone else will answer that.....

but if i was looking at buying one i start with the following

1checking the spot welds match to the factory ones...
2 difference in paint colour
3 excesive bouncing on the road and poor handeling ie shocks gone and things like that
4 oil leaks ie motor gearbox and diffs check for fresh washing.....or too much degreaser use leaves a gold looking residue and white on aluminum
5 when gear changing get a feel for the clutch sliping or an abnormal noise (same applys to the engine
6 also too much wear on the interiour for the kms its got....

good luck keep us posted on how you go