1. Transmission. Auxiliary transmission fluid pump. 2. Yes. 3. No. 4. No. 5. No. Stopped at a traffic light, first inline near crosswalk. For no apparent reason, the vehicle jumped forward without any input from myself. Thought I was rear ended by someone behind me. Luckily, I always have my left foot on the brake pedal when stopped and was able to apply additional pressure to keep the vehicle from moving forward. This is a new to me, used vehicle. After doing research I see that this is an ongoing problem for the 2021 to present Ford F 150 PowerBoost, hybrid, trucks. Hopefully a safety recall will be issued.