Replacing the UEC fuse box in the Proton Preve is a common solution to certain electrical issues such as air conditioning malfunctions. Some users have reported issues where the air conditioning would blow warm air or stop working properly due to problems with the UEC fuse box. The term "leaking" as mentioned by a service adviser might not literally mean a physical leak but could be referring to electrical leakage or failure within the fuse box that impacts the function of connected systems like the air conditioning