Is there a special calibration a Land Rover dealer performs that is any different than the IIDTool's guided calibration? I have some front suspension sagging issues. My local mechanic says it's valve block related, but recommended a calibration at the dealer. Before I go through that...is that step needed?

The suspension sags even after I did the IIDtool guided calibration, fwiw.

One (or both) of your front airbags has probably developed a leak. Lots of @ 2011 cars on the forum having this at the moment, seems to be about the time they go.... .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

As Joe says, you will have a leak somewhere, and no the dealers can't do any more than your IID can to calibrate the suspension... Pete
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2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
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Thanks to you both. Maybe it is the valve block as the mechanic thought it may be.