;)Have had similar problems with a number of other RVs and always considered the propane gas detectors a nuisance until the new 2552 came home. My neighbor heard a noise and alerted me. I checked and could not detect anything, but when I looked at the propane tank gauge it showed consumption since I had it filled and we had not used any propane appliances. A squirt bottle revealed the regulator was leaking badly enough to trigger the interior sensor. Have much greater respect for that monitor now. PC (Kermit) replaced the regulator and line and did a leak check last month. OK now.
I had to replace my regulator last month because it was leaking through the casting on the front side. I have always used Marshall Brass in the past, but used the replacement that PC (carol) sent. I would also suspect a leak before replacing 4 sensors. The only bad sensor I've ever had was in my house and it was 10 years old and should have been replaced sooner.