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Unfortunately, iFixit does not do in-depth of an analysis of products. However, Techinsights does but the report for this device (https://www.techinsights.com/products/dd...) is still in creation as of I am writing this.
Just note that obtaining those reports from them comes through a subscription than a report-by-report basis.
If you can, can you post the teardown of the charging case too?
By any chance, can you attach clearer pictures of the boards please?
So far there isn’t any IC Identifications yet, but I may be able to do some (and possibly even more) if there are clearer pictures.
It should not be too hard to replace stuff as long as you know how to solder. However many chips cannot be replaced as they are either epoxied on or need to be programmed before it would work in the device.
One of the best user-made teardowns I’ve seen so far! Congratulations on making your first one!