Clickiing Noise from Drivers side Kick panel...

[adelphia]

Hello
Can anybody tell me what is behind the kick panel on the drivers side?
Whatever is behind there recently developed a clicking
sound as soon as the engine is turned off. The clicking is very rapid, and
last for about 15 seconds. Sometimes it will stop as soon as the door is
opened, sometimes not. Any clues would be helpful.
Grant
Colorado Springs