A guy I "know" is looking at a 1991 model SeaRay with a Bravo 1 in it. His local mechanic is telling him that any Bravo drive with a serial number below "OK" will not have replacement parts for the upper unit. I had not heard of this and thought Bravos were all the same from their beginning until 2005. Is the mechanic correct and should this guy avoid the boat because of it? Thank you all.