Honda Accord

Hi everyone, I have a 1995 Honda Accord EX, 2.2L V-TEC engine, 120,000 miles on it. While checking my transmission fluid, I noticed oil leaking from a thing on top of the oil sending unit. I took it to the honda dealer but they won't give me any information unless I pay a $100.00 diagnostic fee. Needless to say, this fee has nothing to do with the cost of the repair if I let them fix it. Can anyone please tell me what this part is and if it is expensive?
November 4, 2007.

Bit confused more info is needed
Please pin point the area you are looking at
Or take it to a local repair shop and not the dealer
And I m sure they will be more that happy to check it for u

Good luck

Nov 4, 2007.