I have a rusted drain pan unit in an older Trane XL80 central air system. Has a pinhole in it causing it to leak out. Anyone have a clue where I can find a replacement! 2 contractors told me over the phone that I would have to replace the whole central system since it is so old! Please help if you can. Thanks.

A sheetmetal shop can make you a pan
OR
You might be able to use a 2 part epoxy to seal it.