I recently purchased a used M-K Powerdrive trolling motor. I am in the process of upgrading my boat insurance and putting the new T-M and some new electronics on the policy. My question, the serial number decal on the bottom of the head is not readable for the last few numbers. I have contacted the original owner and he has no records left for the motor. Is there another concealed serial number location or a way to get with MinnKota to find out the info?