Paul W yes they do call those Flex, Charging board or Sub boards besides calling it a Daughter board. The previous link looks like it is for the 928A version. FOr the 928U you would need something [https://www.ebay.com/itm/174883922521|like this] even so I do not like eBay for this.
On your flex cable there are a couple of numbers below the model. Do a search on those numbers and see if you can find other sources for replacement.
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