I still say swap out or clean up the pressure switch.
I assume this pumps water from the lake, and hasn't run much/ all winter?
Contacts are probably bunged up. A cleaning will probably do it, but they're cheap to replace, and easy to do. Most likely a 20-40psi switch, you can find them just about anywhere.
If you need anymore help with it, pm me and I'll send u my number, or get it from tony.
S.