Except for possible inconvenience - as the diff seems OK - what have you got to loose by replacing the oil and continuing to drive - I suspect you will have no issues.
As far as the rotors are concerned - certainly if they are out of limits they would have to be replaced (expensive at a dealer - the rotors are cheap to buy at a specialist). However I doubt they are out of limits or warped - mine have done 260,000 and are still within limits.
I think I would be taking your car elsewhere or doing the work yourself.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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