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  #20  
Old July 11th 05, 06:00 PM
nrp
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I know it's summer, but I once found a leaky defroster hose spraying
hot air on one of our radios making it intermittent. We used a shop
vac duct taped to the defroster air inlet under the cowl to diagnose
it.

I also agree that Narco stuff was marginal & that zener diodes and
other solid state stuff doesn't become intermittent except for thermal
issues.