I have read through other similar posts and it doesn't quite match my problem, so bear with me lol.
We had a massive leak under the house and our landlord called a plumber out to fix it. He turned off the main, fixed the leak (we have old copper pipes that poop out constantly), and the guy forgot to do something before leaving because he left us with no water for 24 hours. He came back out and said he forgot to turn a valve somewhere. This was about 2 or 3 weeks ago. Ever since then, whenever we run showers or the sink, we almost always lose water pressure, usually completely until there is no water running. It takes about 5 to 10 minutes for what I'm guessing is the pump to come on or cycle because the lights dim for a split second and then the water comes back to full pressure within a few seconds. It has gotten to the point where we prestart our showers to let it lose pressure, stop, then come back before we actually take the shower.
The other posts similar to mine all suggested that the pump was failing, or the pressure bladder. Our pump was just replaced last year, and considering this guy was sort of well...incompetent, I'm kinda guessing that the pump or bladder isn't failing. I would like to try to fix this problem ourselves if possible because our landlord is a nice lady, but going through a lot of problems and we would like to spare her the stress of yet another problem in this house. What are some simple things we as non-plumbers can check or try that this idiot plumber might have screwed up or left undone when he fixed the leaks under the house?