Posted by npu on 19/12/2018 17:16:20:

Your machine was born at SIEG in 1996, serial number 1278.
At the time, your motor was sourced from an outside component supplier, and now it is produced in-house.
In theory, a new C2 motor should be an equivalent replacement. However, ARC's policy of non-return of electrical component spares such as this, still stands. Our reasons are based on a range of factors which we do not care to disclose – and we say this with the greatest of respect, pre-sale.
Secondly, if you purchase a hobby machine electrical spare as a B2B purchase (i.e. without VAT), it is considered to be a business sale of a hobby machine electrical spare – which is not rated or classed for business use, and additional exclusion terms will apply.
At the check-out there is a provision for EU B2B customers to place an order without VAT, by following the process stated on our website.
Once the order comes through, additional VAT checks are made, as, for security reasons, we only ship to VAT registered address. Provided this process is okay, and because your requirement is for a motor (or control board), ARC will send you an additional email asking you to accept our exclusion terms. Once you accept the terms by return email, the order is dispatched.
It may seem that ARCs policies on motors and circuit boards are a bit strong. These apply mainly to supply of such spares to customers who have not made the initial purchase of the machine from ARC. This policy is born out of experience. Whilst ARC is happy to serve and is grateful for such orders, it is difficult to ascertain parentage of such machines, causes of failure, and ability of person to fix such problems.
Many such 'broken' or 'damaged' machines have turned up in probates and auction sites, where the previous owner has either died, or put up said machine for sale for other reasons. The new owner purchases such a machine at very low cost, and wishes to fix it. In the fixing process, either a wrong motor/board is purchased, and/or damaged in the fixing process. ARCs prices are very competitive, but it is difficult for ARC to consider returns for these spares, as often it was found that such components were damaged upon return. As a result, this policy was born.
This policy may be difficult for some to consider. We understand and respect this view.
Keeping the above in mind, if npu finds difficulty in considering ARCs policy, or if he finds difficulty in going through the on-line purchase process, we understand, and we are happy to direct him to the other distributors mentioned in Jasons link.
Now that it is clearer that it is a C2 machine made by SIEG, npu can consider and make his choice for where he purchases the spare from. 
Ketan at ARC