Leakage is not an issue whole inner unit is same except for the Ac control card aka PCB...
Its outer unit is different and is with controllable compressor speed / power...
Uband replacement or coil replacement or welding is not a big deal....
Main thing is the PCB which get fried normally due to not doing service (Ac got heated up and PCB give up) or voltages up and down or voltage spikes or bad frequency....
If any of these issues are present (power related) It is good to add voltage stabilizer with surge protection....