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Re: Oven doesn't get to tempurature
On the one hand, no one ever got scalded by cold food.
But if you insist on living dangerously...You can try to find a professional to come out to the boat. Good luck on that.
Which leaves DIY troubleshooting, sequentially. Divide and Conquer.
First, replace or remove the solenoid. Your choice, I'd say replace it but either way, you know it is defective so it COULD be causing a restriction in the supply, and if it IS defective, there's nothing to lose by getting rid of it. That would be a first step (fix or remove) in the process of working through the possible problems.
Second step would be to access, to remove if possible, the oven gas jets. Whatever the entire assembly is, remove it. Make sure it is not clogged (spiders nest in them, rust forms in them, all sorts of unlikely things) and make sure it is not rusted or flaking. Also try to check the part number it there is one. It is unlikely but POSSIBLE that at some time a prior owner substituted a jet set designed for butane or CNG instead of propane, and having the wrong jets would mean it never would get to the right temperature. If there's a visible completely BLUE flame from all burners including the oven, it probably is the right propane part--but remove it and check that it is clean and clear.
Which leaves the thermostat, and that's probably impossible for you to test or check, beyond simply replacing it. That would be the most likely but last thing to do.
Divide and conquer. Assume nothing, because previous owners may have done anything.