2010 Broadway Omnistep

Can anyone tell me where the doorstep relay is in a 2010 EK Broadway. The inside switch is just a pushbutton with 2 contacts. Both it and the understep switch have been checked  and are in working order.
The relay is not in the void behind the fridge. It doesn't appear to be in the EM50 ( behind the driver's seat).
The step doesn't retract either with the switch or on starting the engine ( which it has always done) though it does make a clicking sound. It swings out normally.
As far as I now, the Sargent EC325 has no connections to the door step.

Thanks, Ploughlin. I suppose that means that it's part of an integrated circuit on a PSB ... in which case, I will need  some help, I guess!

Check Fuse 5 on the EM50 before doing anything drastic. Be careful when you replace as there are no guides for the fuse blades.

Thanks Peter,
 Yes, before I took the step motor off, I did check that 20Amp fuse but, as the step swings out, I  thought it would be OK - it was.
 So, having watched U Tubes  etc.,  the motor went on to the work bench, got a good clean and I ran 12V both ways, whereon the motor turned both ways. 
It's now down to the relay ... or a replacement EM50???
Everything else in the van is working except the "step-is-out-buzzer" (with the step out and the engine started).
Now to check the motor supply with a multimeter while a helper presses the step switch.
 ( Yes, the leisure battery is healthy).
An afternoon spent "self isolating" ( except for a few ants running around) so I didn't wear a mask!!!

Thanks, Tim. Thankfully, I can push the step back in. Amazing the number of "posts" on this subject - even since I joined in!
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As ever, what a great backup this forum is - Thanks everyone!

The relay was working so  I traced wiring and soon found a broken wire from the step limit switch with blue ( ie copper sulphate) corrosion immediately at a crimped connection. This was behind the courtesy light just inside the habitation door. Here, 2 wires go into the van from the step limit switch with the 2 wires that power the step motor. But the crimped joins are immediately above a decently sized  grill (which would allow any leaking butane gas from the fridge to sink to the outside). There has evidently been enough moist air to induce an electrolytic effect where copper wire met soft metal crimp. ( Note that this grill is immediately behind the n/s rear wheel !)
This all resulted in the Sargent EM50 sensing that the step was continually retracted - thus it rolled out but would not retract. The broken wire meant that the limit switch could not have produce a "closed" circuit when the step rolled out.
...........................
Sherlock ( aka "Clever Clogs") has some suggestions to offer, but I am very tempted to abandon a motorised step! As it is, I've abandoned the two crimps on the wire joins.