Leaky seals

I have a Nitro R/T, with a trans leak. After taking it to the Dealer,upon picking it up i noticed a leak still! The tech changed the Adaptor plug for the selanoid right there infront of me and guess what it still leaked!Now that i had the Mgr attn he told me that the materials in the seal are incompatible with the trans fluid? He went on further to say that this problem is not unique to Nitros! So where does this leave me? He can change this forever and the problem wont go away? Has anyone else had this problem? any help? Thanks ZippyNitro