On Tue, 16 Jun 2015 17:35:55 -0700 (PDT), Andy
wrote:

The flames coming out of the burners are uneven, so I think they need to be replaced.

Inspect the burners for crud over the holes. Clear them using a stiff
wire or a drill bit of the proper size.

When I bought my Jeen-Air grill 10 years ago, I followed some tips
from an article. Take a magnet when you shop. It won't stick to
quality stainless steel grates, cabinet or brass (no rusting out)
burners.

I clean mine with a power washer with grates and burners removed.