Hi I‘ve just taken the back wheel off my Ribble ALe and now the motors not working- it all looks good - all bolts back all wires connected etc and it’s turning on and setting the assist level but nothing is happening in the motor - l have a call arranged with Ribble and dread having to send the bike back ( it took 6 months for them to deliver and it’s already been back once...) l have done about 70 miles on the bike ...are there any suggestions for what l might check?