C1249 and C1253

Hello.
Sometimes, usually in warm weather, my 2007 Prius would show 4 warning lights: ABS, VSC, both yellow and red ! In circles. Driving does not seem to be any different. If I stop for some time, the lights clear at start. But they might come on again after driving for a while.
Today, the RAC read the errors as C1249 stop light switch circuit, open circuit and C1253 hydro-booster pump motor relay.
The rear break lights are in order - the car has passed MOT.
Has anyone experienced these 2 faults and how were they resolved? Is it worth swapping the 2 ABS relays? I will appreciate any pieces of advice. Thank you.