Toro Reelmaster 5610-D Operator's Manual page 20

A parked or recovery regeneration is
processing.
High exhaust temperature
NOx control diagnosis malfunction;
drive the machine back to the shop
and contact your authorized Toro
distributor (software version U and
later).
The power take-off is disabled.
Sit down or engage the parking
brake.
Accessible only by entering PIN
20