the top broiler quit working, do I need to replace the broiler or is there a fuse that may need replacing? 
Here are your parts
Parts for Whirlpool RF364PXPQ1 Range - AppliancePartsPros.com
See the attachment for the tech sheet
Yes there is a fuse for just the broil element. I think it is item 26 in the Chassis Parts section.
Be sure to unplug the unit before checking it.
RF364.pdf (182.2 KB)