My 4000 had four small holes in the face of the radio. A "wire-type"
device is slid in there, releases the catch and the unit pulls out. No
screws, no trim, no molding to be removed.
I suspect your's is the same.
See your local audio dealer, he can remove it in 30 seconds or less.
Might do it for free, a dealer near me did for free (I bought the unit
elsewhere and he did nothing but pull the old unit).