Squeaky rear brakes

From my recent post about adjusting parking brake on my 2004 Camry LE (125K miles) I learned that it has drum brakes on the rear. Rear brakes were adjusted along with the p-brake.

Ever since, I have had a fairly consistent squeal from the rear brakes (when braking, usually gently). Is there anything I should look into other than replacing the rear shoes?

Try sanding the shoe surfaces to an even dull finish, and bevel the leading edges.