Try Nez Rongero at this e mail addy; he is listed as a dealer and should be of help:
bamban barrelbarn (at) gmail dot com (no spaces, substitute the obvious...done to help reduce spamming Nez's account)
March currently recommends contacting a dealer for service info. Since Shiraz Balolia is no longer the NA distributor the repair center/process appears to be reorganizing....Nez should know how to proceed.