Here's an updated grab after idle
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I've attached wifi and bluetooth info. Thanks again for your guidance.
Your thermals look good for idle , with factory SMC fan rotationals . Looks like your CPU heatsinks were properly re-installed .
We should also do this while your Mac has all it CPU cores and memory at full load / usage . Run this for three minutes , take a screen grab of the thermals while you do this and terminate the operation after three minutes ( go to idle ) . I want to check thermals to see if something is dangerously wrong . This is just a safety protocol . Then , we'll run your Mac's CPU cores and memory at 100 percent load /usage for a whole hour and check the results . If you don't know how to do this stress test , ask please .
Now , let's tackle your wireless issues . I need verifiable data sources for this .
Please obtain the RSSI and Noise figures by wirelessly connecting to your preferred access point and press the option key while left clicking with your mouse on the wireless signal strength icon on the menu bar of your macOS desktop . Take a screenshot of this drop down window . It'll be easier if you use a 5 second delay on the snap . You can block out the personally identifiable info , but I need the RSSI , Noise , TX Rate and PHY Mode info . I'd like to know how close you are to your AP , too .
For the Bluetooth , please run Bluetooth Explorer and we'll take it from there .
Once we're done with that , we'll rebuild the Northbridge . Which is tricky and even most techs never touched it , so you'll have bragging rights over the pros . If it goes right