There are only so many failure points on this thing.
1. The lasers. Apparently there's a log which includes the "mileage" the printer has, including the hours the lasers have been on. The log is on a SD card that is inside the printer. You'd have to take the back cover off to gain access, then remove the card, and read it on a PC to extract the log.
2. The galvanometers. Those are the X/Y steppers of the printer, and usually last the lifetime, but sometimes they go bad. If you can print, they're obviously working.
3. Also part of laser subsystem are the mirrors. There are 2, the large one which you cleaned, and a smaller one that is deep inside towards the back. The small one might need cleaning but not very often
4. The peel motor. That obviously works too, but it can also go bad.
5. The Z motor. Apparently that never goes bad
6. The resin tank/vat. It's a consumable, so as it ages it will become less transparent, and print will start to fail in the spots that have become opaque. A new one is good for about 2 bottles of resin. Move the location of your prints so that you spread the wear over as much of the surface as possible, so you don't 'burn a hole" in one spot, so to speak.
7. The resin itself. It ha a shelf life of about a year. FormLabs resin has either a batch date or an expiration date printed on the bottle. If it's a batch date, add a year to it for the expiration.
I found I can print just fine with resin that is 6-9 months past its expiration date. I just mix it really well before pouring it in, then I cranked up the laser curing strength by selecting a resin type that has a longer curing time. In my case, I'm using an expired Grey01, but I'm printing it with a Clear02 setting. It works great.
Other than this, I can't think of anything else that would need fixing.
There is an issue some FormLabs users had complained about, called "laser flare", and it apparently requires some sort of calibration, but I never had the need to do anything about. If you need to know more about it, go to the FormLabs Forums and search "Laser flare".
To print or, 3D print, that is the question...
SD3 printer w/too many mods, Printrbot Simple Maker Ed., FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.
