When we replaced bulbs in light fixture over dinette it no longer works and the wall sconce and lighting over the adjoining sofa all stopped working. Rest of coach lighting okay. Is there a possibility these 3 fixtures on same circuit? Checked all fuses and they are fine. Almost like lights on xmas tree. One in the "string" goes out and none work. Could this be the case. We are going to try replacing the dinette fixture and see if this fixes the problem. Any ideas???