I am rebuilding the top half of my N62 X5 4.8i. Before it is put back together, what are the hard to reach parts I should replace while everything is apart? Coolant hoses that connect to the firewall? Other sensors? I am open to recommendations with reasons. I appreciate the help as I would love to avoid climbing in my engine twice. I have already inspected or replaced all cooling parts at the front of the engine, replaced transfer pipe, valley pan, water pump, thermostat. What are the unspoken parts? HCV will be replaced when valve covers come off. Hoping the N62 people can chime in.