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I'll let you know if faults are NOT fixed!
Very simple to fix under warranty. Simply contact your Kawai Dealer (where you bought it from!!) and they will arrange for their contractors to come and 'grease' the back of the keys.
It is an unfortunate problem, but one that can be easily fixed!!
I bet they've employed a new worker or machine to test for 'squeakiness' before they leave the factory now!!
The noise is CAUSED by grease migrating from the hammer fulcrums onto the capstans and contaminating the key sliptapes. The only lasting fix is to renew the slip tapes and teflon powder coating, and remove the excess grease from the hammers.
This is very labour intensive [costly], but the only certain cure.