Please disconnect and connect with piano and PPC55RCD again.
Please enter Test mode again and check CTRL sheet again.
CTRL sheet -- foward -- Ver.piano mode check again following item.
V4.10 Apr 01 2000
55RCD|ENG|REC|GP|S|DB51
If you see difference item then push play and enter edit mode and edit item.
If you see the same display then PPC55RCD is OK.
PKCTL/Power unit/ sensor /pedal has problem.
55RCD=controller model
ENG=language
REC=recording model
GP=piano type
S=Silent piano
DB51=TG model
Let's try again!