When did you buy your PB 1100? Do you have 3 porcelain grates or 2 porcelain grates? The reason I am asking I know 2 others who had rust as well, but they had the 3 grates as Pitt Boss changed the PB 1100 to 2 grates.
It may not be nothing I was curious as I have used my so many times I do not have rust and I have the 2 grates,
I have this same problem I have had my grill for a year and there is severe rusting on the front. I have the 3 grates all of which have cracked. Disappointed in Pitboss grill.