Ive had my 252 FSH for 8 months now, and there are a few minor issues. Its interesting that you bring up the Side Scan not working on the Simrad graph. The reason it doesnt work is because there is only one transducer on the boat and its for DownScan. I confirmed this yesterday after discussing with my dealer for the last 8 moths when my replacement transducer would come in to fix mine, as it was not working since I picked it up.
The skinny: October 2020 Ordered boat, was told side and structure scan was included. Ordered premanufacture of the 252 so there wasnt one to "test" all the features. received boat April 2021, took out and side scan didnt work. Returned boat to dealer May 2021 for 10 hour service, and some minor warranty repairs including side scan. Picked up boat and was informed side scan was not fixed as Yamaha service said the transducer was bad, and they we on national back order. Returned boat for 50 hour service (about 3 weeks later,) and side scan was addressed again, dealer saying still on back order. Enjoyed boat all summer, annoyed that side and structure scan didnt work. In July I contacted Simrad directly, and was told they were in stock but I had to go through my dealer since it was a part of the OEM boat sale. Took boat in for winter service in December. Talked to them again about the transducer, was told they would work on it again. Same story from Yamaha, it was on backorder. Called Yamaha, spoke to customer support. Explained my situation. Was informed by Yamaha that the boat did not include side scan transducer and it was not designed to have that feature. Called my dealer, discussed with them Yamaha's comment. (Have names of all these folks) and my dealer said they would take care of it, but it was still on national back order. I found one it's part number Navico LOW000-11460-001with Y cable. They run anywhere from $1150 to $1800 online and they are thru hull paired transducers. My dealer is a stand up group and is making it right on my boat as they believe they were told the side scan and structure scan was part of the package. 2021 was not a great year for manufacturing anything, and Yamaha boats are no exception. My suggestion is get the YES warranty for the full 5 years. This is my 3rd Yamaha boat, love them, but quality is not top notch in this model year. Nothing like my first 2012.
At any rate, your side scan will never work with the transducer on the boat, unless they changed their minds and put i on there after mine was built. I did get one of the first off the line in April last year.