The elements and fan work fine ?
Did he check the element with a multimeter ?
I mean if any of those were not open circuit why was it replaced?
Please check this IMAGE #1
(part#206 and part#209 are temperature regulators), did he replace both of them ?
Part#249 is temperature limiter, did he test that part with a multimeter ?
Also check this IMAGE #2
If the above parts from Image#1 appear fine then test part#503 for continuity.
After you have tested the above parts and they are all fine/replaced earlier then check this IMAGE#3 (part#804 will need replacement).
Let me know how it goes.
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