Since the repair person actually saw the fuser I would take his word over someone on the Internet, and he would not have been referencing it by page count, he would have been judging by the roller itself and experience with them.
The page count is the expected under ideal circumstance, but it won't make it even close if the end user is loading odd stocks improperly set for weight. So if you have it set to plain paper and load cardstock, the fuser takes damage. And if you have the device in a humid environment, or in a cold area, it can cause fusers to wear out faster than under the ideal.
Your page count does seem extreme to be fair, but if the repair person warned you upfront of a future failure, there had to have been a reason, so it would be much more beneficial to just contact them again to ask what they saw and what they think may be the cause so it can be avoided in the future.
And all that is not to say the fuser is the cause though, the fuser gets used whether or not a job is duplex, If it is just a duplex issue it is quite likely that there is toner contamination in the duplex unit, else it would be appearing on simplex jobs as well.
So take out the duplex unit and have a look
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Joe Arseneau
