Done some homework, haven't got a clue how to put a pdf. file onto this network but take my word for it, all boeing a/c from the 707 to the 747-400 must make corrections to all altimeters (inc. EFIS altimeter tape) as there is absolutely no correction applied whatsoever by CADC's, DADC's or ADIRU's. Whichever 'techies' you've spoken to are wrong. For more info contact, Chief Pilot, Training, and Standards, Flight Crew Ops, Seattle. Tel No:206 655 0878 and ask for Flight Ops Technical Bulletin ATA Number: 01
Here's a quote from Boeing's Bulletin: "Pilots should note that for very cold temperatures, when flying published minimum altitudes significantly above the airport, altimeter errors can exceed 1000 feet, resulting in potentially unsafe terrain clearance if no corrections are made."
Maybe this rumour network just saved someones life.