We have a Coleman Spa Model Horizon 244, it is in excellant condition. We are the original owners and have kept it up and it has always been enclosed in our patio. We need a diagram that will show where the check valve is located that goes to the blower. The check valve is currently leaking water back to the blower. The lines under the hot tub are currently covered with insulation and the check valve is not visible. Thank you for your help.