The main problem is that the special Bosch tools are needed for safe (non-damaging to internals) disassembly and reassy....I watched the Bosch guy here take one apart and the tools are special items....The pressure and flow bench is another item as pictured above...those things are major bucks...
I think they charge over 100 dollars just to hook up an IP for testing.....
The good news is that most of our Bosch inline pumps are ok even with all the miles on them.....A lot of IP's get rebuilt that don't need rebuilding......

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)