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Those are the ones that are supposed to be replaced.
Well you have all three fluids under there. Fuel, water and oil. Generally the top of the motor shouldn't get hot enough to vaporize oil or water and fuel would be pretty obvious. You would have definitely known that smell.
Was it thick smoke? Blue tint at all? Mazda spring clamps or American screw?
Oil would be coming from metering lines or turbo blow-by in the intake.
Fuel either fuel lines(non-mazda fuel lines or clamps), injectors or regulator.
Water, from that area would be the 90*(691A) hose, (non-mazda clamps)
The reason I mention clamps is because Mazda spring clamps change tension with temperature, they always maintain the same clamping pressure. Where screw type remain the same. The other problem with screw clamps is that people get frisky with over tightening and damaging the hoses causing leaks. Non-mazda, non-metric fuel lines or screw clamps are one of the biggest causes of engine fires. Out of all the engine fires I have had to repair only one was the result of a leaking injector.
With the fans on the source area could be somewhere else, not under the UIM. My guess is oil and or water hitting the turbos. I had one car that had me going for awhile, it had a smaller than pin hole leak in one of the welds of the turbo water line.
There is also the possibility of something electrical small but possible.
Carry a fire extinguisher, just in case. Until you can 100% rule out any fuel issue.
This just because I can not see or smell the car.
You didn't drive through any water did you?
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