Don't mess with PR. Go to the highest accessible corporate person responsible for appliances. Electrolux owns Frigidaire, so it's:
Head of Major Appliances North America, Executive Vice-President
Don't assume it won't get to him. Many people who email executives are surprised to hear from the executive, and not just from a minion. Remember he hasn't heard your story before. So you have to begin at the beginning and recount everything you've tried and experienced.
I would also make a point of mentioning that it's been the subject of a long running discussion here, with a lot of active cooks interested in the problem.
I honestly don't know what you can reasonably expect, but whatever they're going to be inclined to do, this guy has the stroke to do something substantial.
That email is about a year old. If it bounces, go to the alternates. Our you can CC: all three. But Mr. Scott is directly responsible for U.S. appliances.
Carina Malmgren Heander
Senior Vice-President, Human Resources and Organizational Development
+46 8 738 60 00
President and Chief Executive Officer