Y is for Wilmington.
444 is for Sandalwood (or Neutral) all-vinyl interior.
48 is for Midnight Green.
04A is the build date.
04 = April
A = first week
0653 is unknown.
C61 is option code for automatic-control HVAC system.
B79 is option code for rear end exterior ornamentation.
This option is probably for additional trim around the rear deck area.