Opening the top of a Hafler p-1500 amp. Please

Thank you.

I did unplug immediately. The “shake-n-bake” routine didn't work originally as the little sucker is probably lodged inside. I need to open the top--I know, it doesn't seem like rocket science--but I just can't figure it out.

Anyone own or owned this amp?

Magfan, thank you. Yes, the picture of the one open does help in my quest.