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I can not find one that looks anything like your diagram.
but can relate this general blurb at the front of the testing section.
" The vacuum system is subdivided into 7 text circuits, the main switch, the compressor switch and the switchover valves. If a given trouble prevails eg, center jet not opening, the respective circuit can be tested first.
If a leak or functional trouble is suspected in entire vacuum unit,proceed according to 83-615 and preform each time the first test step ( total test ) of an individual vacuum circuit until the faulty vacuum circuit is found. Then continue testing the respective circuit until the fault is found ."
Two special tools are specified
116 589 25 21 00 tester for vacuum
115 805 03 22 distributor
self made plugs welding wire 3.. dia 40 mm long
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