late to the party but when we wanted to look at the existing wiring on this 44 year old house, I put together a spreadsheet of every receptacle in the house, every switch and what it went to. I put all the permits related to electrical with it. When the home insulation was sucked out for new insulation, I paid a local electrician $250 as a retainer to look over the spread sheet and permits, than another $250 to go thru the whole house on an inspection. He suggested upgrading 5 or 6 outlets to GCFI, corrected a couple small issues and billed me about $250 for labor and parts. He works most of his time building new homes and tract homes, and knows exactly what the inspectors look for. When the inspectors came out to look at some plumbing and the insulation we were doing at that time, I paid them to also look over all the electric to make any recommendations as to things that might concern them. Nada. Insulation, plumbing passed, and electrical looked fine. I don't think I would use the Internet as my means to make a decision. I did that on a ground wire for the shed sub-panel where people here said I had to have one. Both the electrician and the code inspector said it is Ok, we won't make you take it out, but we don't require or recommend it here due to lightning being so rare. Hire an electrician to make the inspection, and help him / her by doing the grunt work of putting together a spread sheet of what is on each circuit. Pull permits on the home since it appears the panel was replaced prior.