There will be no detailed service manuals made available for the SL300 series or the XPR3000 series to anyone, according to Motorola. Only the parts visible in the Basic Service Manual exploded view will be made available. No board level repairs or troubleshooting (with a manual) will be allowed.
So, get used to adding that Service from the Start package and extended warranties to your sales, and then be prepared to flat rate any difficult repairs, because M isn't going to support field board level repairs.