Ref a post near the beginning....
IF the POH states a "SE Ceiling of 3000' "then you must be able to climb at >100 fpm at MAUW to SE ceiling. If you can't then the plane is not performing (after taking into account density alt of course).
as well as being able to hold altitude at or above MSA.
What happens when MSA is 10,000'? No way will a BE76 at MAUW climb.....