It sounds as though either the pushbutton may be broke or out of alignment. The recline works by pushing the latch pawl out of the locked position to allow the handle to recline. I have the user manual link and while it does not have that particular maintenance item the beater bar disassembly should let you see the mechanism to see if it is broken. http://www.eureka.com/FileLibrary/e3d6977195674480857fbdfd0948b1a6/en_88151_OwnersManual.pdf
Answers & Comments
It sounds as though either the pushbutton may be broke or out of alignment. The recline works by pushing the latch pawl out of the locked position to allow the handle to recline. I have the user manual link and while it does not have that particular maintenance item the beater bar disassembly should let you see the mechanism to see if it is broken.
http://www.eureka.com/FileLibrary/e3d6977195674480857fbdfd0948b1a6/en_88151_OwnersManual.pdf