'86 190E - Need Central locking system Diagram or Flow Chart

I tried to fix the central locking system by replacing the vacuum pump located under the RR bench seat.
Tried to plug the vacuum lines -one at a time- to isolate the leak. The
system still doesn't work right.
I am pretty sure I could fix the locking system if I had a complete vacuum schematic or flow diagram.
Your advice is appreciated.
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I try my best here
LF +-----+ RF | /| | / | LR - | - RR VP+ \ + FD | TL ---
Where LF: left front door; LR: left rear door; RF: right front door; RR: right rear door; VP: vacuum pump, under rear seat; FD: fuel door, element accessed from trunk; TL: trunk lock +: T or fork
Yours is 86 so LF, RF and Tk vacuum elements have electric wires connecting to VP. When any of these is unlocked/locked by key, VP will be activated and open/close all doors. Vacuum locks and pressure unlocks.
Front door vacuum tubes go up from floor into A-pillar. Rear door tubes go from B-pillar. The tube between front doors go under the carpet, just behind the fron bolts of seats. The tube on RHS runs along the right edge of the floor, also under carpet. I don't recall exactly how the rear tube goes. It either tees from VP or from the RF fork, but I am sure there is only one tube that reaches FD first then trunk lock.
All elements should hold vacuum for at least 1 minutes. Use a hand vacuum pump and some caps to test. The hard plastic tube usually outlasts the car. Leak may be in element, then the rubber T or forks. Retest vacuum after replacing anything. There may be multiple leaks in the same branch.
Hernando Correa wrote:

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Wan-ning Tan wrote:

vacuum lines are routed, the troubleshooting should become easier.
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