If you are having a problem with one shift then the problem is internal. The 2-3 involves application of k-1 clutch pack. There are teflon seals between the front pump housing & the clutch drum, bet they are worn & allowing the clutches to slip.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. TECH
190E 2.3 ITS RACECAR