We picked up a new 2018 22 SSRFBXP this year and love the boat. We have the KMC10 with Kicker sub and amp upgrade. The last time we went out the sub-woofer was not working from the get go, rest of stereo working fine. No wiring seems to have disconnected and never had this issue before. Any recommendations out there where to start the troubleshooting without pulling it all out? It is securely mounted in the far corner under the helm. Thank you.