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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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
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Thanks to you both. Maybe it is the valve block as the mechanic thought it may be.