<spam alert on - Les at LT-Racing is my very best friend...>
Les Tinius at LT-Racing has more experience with Sachs & Marzocchi suspension than anyone else - he typically does 3-5 sets marzocchi/sachs suspension every week...
Les and also his brother greg who works with him are both Gold Level Honda Trained Factory Master Techs with over 30 years experience. Les also has experience working as a machinist (Boeing, etc.) with machine tools on site - so modifying the forks to shorten the bike or fix internal inefficiencies can be done on-site with minimal or no cost to the customer.
Whoever you use - make sure they completely disassemble the fork, including the cartridge and that they revalve all three valve stacks - rebound, compression & mid-valve. Most shops only touch the compression valving and some charge an extra $50 to crack open the cartridge and get into the mid-valve - which needs to be addressed on both the marzocchi and the sachs fork to allow them to work smoothly in roots and rocks.
FYI - Les at LT-Racing completely disassembles and revalves every circuit in the fork and this is included in his "standard revalve".
www.lt-racing.com
Jeff