Usually if you look close, several parts have burn or blackened area at point of solder.
This indicates that multiple parts are affected... replace timer.
Otherwise, there is no schematic for these types of digital timers that shows the value of parts.
Following resources have images of similar problem, and similar timers.
http://waterheatertimer.org/Timer-caught-fire.html#resistor
http://waterheatertimer.org/Boxtype.html
http://waterheatertimer.org/How-to-wire-GM40-timer.html
Gene
Water Heater Timers Save Money
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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