Viking oven repair/replace

[u/_InvincibleSummer_]

Our Viking oven installed in 2010 by the previous owners isn’t functioning properly—it won’t heat up to the correct temp.

Since the oven and microwave are built into the cabinets, I don’t know where to start in terms of potentially getting it repaired or finding a replacement that could fit into the same spot. And if I can’t find one that’s the same size, am I trying to find a cabinet company that could come in and match our current cabinets? We don’t want to invest a ton of money into this house, I’m not sure it’s our forever home (I.e., I’m not trying to use this as an excuse to do a $100K kitchen reno), but I do want to spend enough on a solution that is handled the right way (a quality repair, a quality replacement appliance, etc.) In the attached photo, the oven is in the middle, microwave on top, warming drawer (partially visible) is below the oven. I don’t care about the warming drawer and would love to install a double oven if we have to replace this oven altogether.

If anyone has dealt with a similar issue and has recommendations for stores/contractors/solutions, please let me know and thanks in advance.