Yup, I've only had mine open once, when the A/C fan fell loose. To my recollection, the one bolt at the bottom back took a little doing to zero in on. That's not to say your rig might be different than ours. Hopefully someone with an '09 Contessa will chime in with definitive info. Note the embarrassingly rusty bolthead under the corner of my also shamefully filthy louvered panel; that bolt and one like it at the other end should be what you are looking for, unless your panel is fastened differently.
Joel