TLDR Schedule:
Annual:
replace pump tubing
inspect all connections
inspect and clean injector
Biennial:
Replace all tubing
Despite having had a 45mphp10 for seven years and tending to emergency failures at random I still have not established a regular maintenance routine. That said, and to add to this discussion, I should be replacing my pump tube every year since it seems to fail unpredictably only slightly less often than that. The UV tubing that goes into and comes out of the pump seems to fail just slightly less often than every other year (in sunlight). When the intake tubing fails I generally remain clueless until the pool starts shows me something is wrong unless it happens during a period when I'm testing fairly often and even then it's pretty hard to pinpoint the issue without prior experience. I've had similarly timed issues with the duckbills (inline tubing check valve) failing when they get rather stiff suggesting they probably should be replaced every other year.
Less common issues exist as well such as over maintaining (read to much lube) for the roller assembly has led to them not being able to stay engaged. Just today I discovered (again, seven years of operation in indirect sunlight) a broken tubing housing which was only visible during operation when the rollers push the housing open at the break. This may have related to another issue a couple of months ago where my Stenner injector had entirely crystalized closed at the point of insertion causing the pump's output tubing to blow.
Don't get me wrong, I still love the Stenner, I just need to be better with my maintenance schedule.