New Range Rover kneeling overnight — and the network fault that was never the air spring

What the diagnosis found

Because the strut tested good, the platform widened the search and correlated the sag events with the vehicle's sleep/wake network log: the rear height sensor was dropping off the CAN bus during deep sleep, so the suspension ECU lost a corner reference and bled it down. The leak everyone was chasing did not exist.

Ranked probable causes

How the system reasoned

An overnight sag that a pressure-hold test cannot reproduce argues against a real leak. Because the strut held, the platform looked past the mechanical suspects to the network and caught a height sensor dropping off the bus in deep sleep — the true cause, and one a parts-led approach would have missed entirely.