Great pic...thanks. It would be a hard sell on water marks and corrosion alone to a home owner. Do you have any additional information? Flame? Drainage? Rollouts? It would be great to get a pic of the ruptured heat exchanger. Cutting a piece out the side would be proof beyond a reasonable doubt.....That is, if you're tagging the furnace.
Here's one I had recently......the flame wasn't right and I hadn't noticed the metal chips until removing the burners.....it verified what I couldn't easily see. The original issue was a rollout switch tripping. It's fortunate this issue was found before a fatality.
What I found was the inducer was leaking, where the two halves were put together water was draining out, after I pulled and fixed the inducer all of the water dried up. I am going to return to see if there is any other issues. It's a bakery and the furnace was installed last November.
here are some photos of a trane furnace I seen this summer when going a ac call. Furnace was only a few years old. The transition piece was not racked but the secondary had little cracks everywhere and of course would leak. Homeowners ended up doing new heat ex changer even thou I suggested a few furnace but I understand there issue I just wish trane would do something about this.......
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If you can not do it right, Why even do it at all?