transmission in s 420

[GoodBoy]

there appears to be some seapage of transmission oil from the area where i have been told the "electro-hydrulic connector" entered the tranmission. this unit is on the right front of the tranmission. there are wires connected to the unit. there is a tin sheild protecting the unit. i was further advised this unit has an "O'' ring seal. if my information is correct how do i remove the unit to replace the ''O'' ring? also is a dip stick available for checking the fluid? i read the operaters manual and they advised the system was sealed and needed no checking unless a leak or shifting malfunction occurs. in my interest to investigate where the dip stick would normally be i broke off the red tab on the cap in order to get the cap off. i don,t believe much fluid has been lost at this time because i have been able to blot it up with a paper towel . the car is a 1999 with 88186 miles. as always your help is greatly appreciated.