My DLL leaks memory

I have a DLL that leaks memory, this DLL is critical to my companies
application.
The DLL is from a 3rd party vendor, and they are out of buisness, so
there is no way to get the source.

My thought was to disassemble the DLL and add a few lines of assembly
to fix the problem.
But if I insert a line then all of the function calls will go to the
wrong addresses. So I was hoping for a disassembler that would take
care of this for me.

I was wondering if someone could recommend a tool to do this.
I dont want to spend too much time on it, but I thought I would at
least give it a try.

So a recomendation for a good disassembler would be great.
And any recomendations for other tools that would help with
reassembling or finding the leak would be much appreciated.

.

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