Upgrades done In Heidelberg SM-74-2 since 2004

Can anyone let me know what are the upgrades that Heidelberg does in SM-74-2 Since 2004 till they stopped SM-74-2 Manufacturing? As far as I know, they moved to Single belt Suction belt in either 2004 or 2005. Can the members share the ideas so that it will be useful for the printers to look into when buying used machines.
 
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