Behind the neutral safety switch you will also find the B2 reaction valve which is a source of a fluid leak, the internal o ring can not be change externally, if it’s leaking clean the valve and case then use a good sealant on/ over the reaction valve.

The KD solenoid valve/ bolt should have three o rings on it if not you are missing some. The electro magnetic body should not have oil in it, if it does the o rings are leaking or the body has a crack in it. The electro magnetic body has/uses a washer between it and the case which seals the case and body from fluid leaks and also sets the depth of the solenoid valve into the case, without the washer the fluid feed to the solenoid valve/ bolt may, could be partially block affecting KD shifts