Here is a matrix to determine the year and month that your Fisher & Paykel Appliance was built:

The first letter in your serial number is the year code:

C=2001
U=2002
M=2003
B=2004
E=2005
R=2006
L=2007
A=2008
N=2009
D=2010

The second letter in your serial number is the month code:

F=January
I=February
S=March
H=April
E=May
R=June
P=July
A=August
Y=September
K=October
U=November
L=December

So for an example:
Serial Number of RPU766991 translates to a machine build date of July 2006.