I'll bite.
Here is a link to the latest on this from the AAIB (British version of the NTSB):
http://www.aaib.dft.gov.uk/latest_ne...in_s1_2008.cfm
In the report they said the left engine thrust reduction happened ~ 7 seconds after the right engine. They also said the data shows the EECs slewed the fuel metering valves further open to attempt to increase thrust. So I would say the EEC was not the issue.
They also apparently found evidence of fuel pump cavitation on both engines (even though the plane had enough fuel on board).
What does it all mean? I think you're right. RF-induced failure, but not from a car below. It was an airliners.net pax who had video camera, iPod, and cell phone on.