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knocking noise

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2015 85D has a knocking noise that actually starts when you open the drivers door. Stops when to press the brake pedal and goes on and off whilst driving. (can be felt slightly through the brake pedal)
Anyone had this???
What I've found so far. Tesla used a Bosch iBooster system to Produce 'Power Braking' similar to ICE vacuum power Braking Boosters. Have found no Tesla Owners talking about this problem, but weirdly the 2017 Chevvy Bolt had exactly the same issue and uses the Bosch iBooster as well... Many comments online and lots of expensice iBooster replacements bu Chevvy Service until in 2018 a drive-in (no over the air updates!) Chevvy Update fixed the issue. My Car has been living on an island with no Tesla Service for 7 years covering less than 5000 miles..!
Does anyone know anything about this issue - and whether there was an update to fix it?