Well even without the serial number I now know it's a Reflex built between September 2004 & January 2009.

Does the truck have weight measurement option fitted? If it does is it still working?

I'd get your working truck alongside & pop the inspection covers of & investigate the X54 plug on that one.

X54 is linked in to the extra valve that speed's up the lowering in the freelift area & it's also linked in to the weight measurement function on the truck.

Y15 is listed as tilt up valve coil
Y16 is listed as spare 1A

So is it a Reflex that does has tilt but no sideshift fitted?