Cliff sensors

I have a 'new to me' P10 pro ultra.  The issue is that the cliff sensors won't allow it to work.  They don't need cleaned.  I suspect one is broken or disconnected.  I don't expect any warranty.  Is there something like a maintenance manual on how to test and replace cliff sensors?

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Hi,

There is currently no publicly available disassembly or maintenance manual for testing or replacing the cliff sensors. The cliff sensors are precision components, and we do not recommend attempting self‑repair or disassembly, as it may cause further damage.

At the moment, we also do not offer cliff sensors as individual spare parts for sale.