You found it. Video format. There’s also the Aillio → Support → General → Online Manual which touches on it.
Beyond that search here on roast.world Community for user-provided maintenance ideas.
In addition the sweetmarias.com site has Bullet maintenance info. Actually, it’s been awhile since that info published so you may have to look on legacy.sweetmarias.com to find the link. It’s old but still pertinent.
As a starter, beans with a lot of chaff will require vacuuming the collector thru the rubber trap at the bottom every one or two roasts. In any case clean the chaff filter after every session. For some here a session is one or two 350g roasts while for others it may be 10 or more 1kg roasts. The on-line manual mentions a total green weight for certain maintenance steps. The range is broad as it depends on the beans (oil, chaff, final temp of the roast).
Some here use dish washing detergent for cleaning others use Simple Green. Stronger cleaning agents will require gloves (useless roasting great coffee if you can’t pick up the cup!). Paper towels work ok for cleaning but soften and I suspect leave trace amounts of paper residue so I prefer the cotton bar towels… which leaves trace amounts of cotton fiber but I think it’s less.
Not mentioned elsewhere in any official sense, but I keep track of the maximum difference between IBTS and BT during the early part of the roast (pre-YP). With my 550g batch size that difference should be greater than 40F°. If it drops below that it indicates IBTS needs cleaning. That error can become substantial if you don’t do the cleaning (cotton swab plus alcohol) and that means the preheat temp will be higher than you think it is. The IBTS-BT temp difference will be greater with smaller batches and less with larger batches. The BT probe is largely independent of batch size which makes it a decent reference.