are you sure 质保也会自动转给新主人。 I checked the YAMAHA warranty , http://usa.yamaha.com/support/warranty/pianos/images/070109_Acoustic_Piano_Warranty.pdf it says: ( 1st pharagraph: ... specially authorized dealers and is pleased to offer you, the Original Owner, the following Limited Warranty,.... ) ( 2nd paragraph: COVERAGEL ... Any evidence of alteration, erasing or forgery of proof-of-purchase documents will cause this warranty to be void. This warranty covers only the Original Owner and is not transferable. )
Yamaha warranty is not transferable. I believe the store can provide store warranty. As long as you don't move the piano out of the city, you're covered.