Following the factory service manual instructions re. how to access
€œmaintenance mode€� on HL-2270DW laser.

Steps in the manual say:
with front cover open hold down Go button and turn on power. Hold Go button
until all LEDs go on, then release. Now press Go several times (unique to
each function) to get the desired result (diagnostic printouts, etc.).

I get nothing but an €œError€� LED.

The printer is otherwise working fine.

Anybody share their experience with this routine?

Thanks.