Atwood GH66E water heater runs but keeps sparking

Hi all,

Lately I have noticed that my ancient (27-year-old) Atwood GH66E water heater lights off fine, but it keeps sparking as if it is not lit.

Today I opened up the access panel and noticed the control module housing is melted! I can see a little lightbulb inside the module now that flashes with every spark.

Movie here:

https://www.youtube.com/watch?v=-QOLPvltitM

It looks to me like the module melted itself, not that the burner melted it, or I would expect to see more evidence of flame outside the burner chamber.

Do you think the module ate itself?

Also, is this a good replacement?

https://www.makariosrv.com/dinosaur-universal-ignitor-board-with-post-small-uib-s-post/

Anyone recommend a better or different replacement?

Steve

Edit:

I'm confused. My module says:

Mark 10-12-2-5.5-5.5-E310

But, Atwood P/N MPD91731

91731 leads me to:
https://www.makariosrv.com/dinosaur-replacement-ignitor-board-uibs/

But Mark 10-12-2-5.5-5.5-E310 leads me to:
https://www.makariosrv.com/dinosaur-universal-ignitor-board-with-post-large-uib-l-post/

The last one looks more like mine.

Picture of control module label:
https://i.imgur.com/QA2ywf2.jpg