Part 2 is for defects that could cause an airworthiness issue for the aircraft. By entering it, it may not render the aircraft unserviceable, but act as an advisory, UNLESS the defect affects the proposed next operational flight.
EG> your tyre is low/flat. Would it affect a takeoff and cause a landing mishap. Yes. But can it be easily rectified without professional labour or specialist equipment, then don't enter it. Just get a fuel truck to inflate it with their air compressor. BUT if you needed nitrogen, a nitrogen bottle & regulator [thus a mechanic] then YES, put it on the MR.
Generally anything requiring tools, professional labour, and may deem the aircraft unsafe for night flight or navigational tasks, then Yes.