TO go much farther you need to find what codes are stored in the Trans computer. ALMOST every time that there are problems with this trans it's the solenoid!! However wiring connection problems are possible. This is an analog code & easily read with blink light or impulse tester.
ONLY cars with 722.5 & 722.6(trans types) have computers. THE W124 260E doesn't have any computer controls.
MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)