Google push industries, but to hit on the highlights. Their topline tuning service cost $150 and includes a complete rebuild which comes with a a push designed and milled piston, new seals and O rings thru out, fresh torco oil, a fresh nitrogen charge, etc: They also tune your 3 propedal positions makeing your plush setting plusher and your firm setting firmer and you guessed it goldilocks your middle setting JUST RIGHT. They test the shock and send you preliminary psi and dampening settings to run as a base point based on your weight and riding style. I will post a follow up once I get it back and have ridden it a few times