What tune is it humming, only joking, before you replace anything have you disconnected the hydraulic pump from the motor and tried running the motor on it's own?
When I was at college many years ago one of the other apprentices told us that an electrician he worked with said when he wired lighting the minimum size was 2.5mm and sockets 4mm
Surely you will need these receipts for when the taxman comes calling, otherwise it how would you prove you have spent X amount of pounds for parts to carryout the work you have been paid for?
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