Power surges are one of those failure state, where you never know what failed and how bad the damage is... Doing it yourself takes a lot of time, but can be see

Power surges are one of those failure state, where you never know what failed and how bad the damage is... Doing it yourself takes a lot of time, but can be seen as a fun hobby, but doing it commercially means wasted hours when you could have been paid the full fee, and a high chance that the customer will come back in a few days, because something else failed on the device and blame you.