Allaerts down-repair or ??

After about a year in my system,the ECO has ceased to produce any sounds from the left-hand channel.After speaking with my dealer and Audio Advancements,I was told that it would take at least 6 months to get the cartridge repaired.After inquiring further,it appears as if 24 months or more may be the "real" time period.
Would having someone else take a "look" be an unwise course of action,as this would negate my "warranty".
Your thoughts?
Happy Holidays and thanks in advance for your response.