Hi, this is my first post, and I would like some advice. A couple weeks ago I started having intermittent power outages on only one circuit. At first it was a couple times a day for only a minute or less. It would go off then right back on. Called the electric co because at first I didn't realize it was only one circuit and we had a bad storm and it kept doing it every hour or so. They came and fixed their end. The problem continued but only once or twice a day. Only one circuit and the breaker did not trip. I changed out the electrical outlets ( they were all back stabbed) and checked the two switches that were also on the circuit. I was going to change the breaker, but my husband wanted an electrician to check everything out. He came and changed the breaker, but now he is telling me that I need new service and a new meter box ( never checked it) as he sees corrosion in the box. What he showed me was, rust on the bottom of two of the silver fasteners that hold the breaker together,( this one he replaced), two small dried rust water drops in the bottom of the breaker box, and rust on the fasteners of another breaker that he did not change. No rust on anything else on the box. He told me that water must be coming in from outside and the aluminum wire that is coming into the house needs to be changed to copper to the tune of $700 or so. I don't have any other problems with the electrical and haven't had until this incident. I will get it done if need be, but if I don't really have to I obviously would rather not. Should i just change the circuit breaker with the rust on the fastners? Sorry this is so long, but I wanted to give context.

Long story short, my electrician pulled new wire for a portion of a multiwire circuit. He said he pulled separate neutrals for each leg of the mwbc. There is now 2 neutrals and and 2 hots in the same conduit as it enters my panel. However, Im thinking he may not have made the splice in box where the neutrals split. Instead I think he was downstream between that point and the panel and instead pulled two neutrals and spliced with the shared neutral.... in other words, instead of 2 splices and 4 wires for the grounded conductors (giving each a return back to the panel).... there is 1 splice and 3 wires. That would mean the two circuits are still sharing the neutral. That probably makes no sense.... but I thought I would give it a shot so I can have an idea while speaking to him on the matter.