I pull my risers and manifolds off each fall after coho season. I can clean them up and inspect them. New gaskets are cheap. I also run an electric bilge heater with a built in thermostat all fall/winter. It not only keeps the bulge warm it keeps it dry. Electricity is cheap and you can’t put a price tag on peace of mind.
That’s the same heater I use. Like I said you can’t put a price tag on piece of mind.https://www.caframolifestylesolutions.com/product/marine/pali/https://www.caframolifestylesolutions.com/product/marine/pali/
this is what i use, and i have a temp stick that i record my engine room temps all winter i can see when the heater cycles on and off