I've come across a few posts elsewhere saying Platinum did cover it.
I'd see if you could get something in writing that it would.
They do say this for exclusion but a lot more going on inside than just the bulb.
"Light Assemblies/Housingsand Light Bulbs including LEDs"
In all honesty I would probably purchase a genuine extended warranty on anything new today. If you can get it for a cheap enough price 1 or 2 repairs will probably pay for it with current shop rates.
Looks like a Powertrain only VSA...
Timing cover weep/seep/leak isn't uncommon either. I just live with my minor seep/weep even though it was repaired once under basic powertrain warranty. That is probably the only thing I would have made them fix under an extended warranty. Nothing else required any post warranty dealer work...
The one in the trunk area is the intake. The exhaust vent for the diff is on the top of diff . I ordered one of these back in 2016 to confirm it was an exhaust only diff valve using some vacuum tests. On the top of rear diff somewhere.. think I located it in the day but can't remember now...
21-5C1 in this schematic is reportedly the breather tube for AT
https://www.zoomzoomnationparts.com/p/Mazda__CX-5/BREATHER-PIPE--BREATHER/105422307/FZ11215C1.html
Probably terminates in similar areas as the ‘13-‘16.5 models.
Former member hear with a ‘14 CX-5 IIRC… lost his diff from water intrusion.. TSB was unknown at that time years back.. he thought a water crossing but I think it was from a car wash
I change my front transfer and rear diff on 30k...
Anyone know where the diff vent terminates in the rear area of a 3 AWD? I wonder if there is a rare issue with a car wash that allows water in like the ‘13-‘16.5 CX-5 models?
Reference...
You can view rear diff engagement as well. Forscan being discussed here but you can also view with OBD Fusion/Link. Be sure to double the value shown to see correct percentage of engagement.
https://mazdas247.com/forum/t/2016-cx-5-awd-system-questions.123878840/post-6772708
It wasn’t hard to replace
https://mazdas247.com/forum/t/cx-5-rear-diff-and-transfer-case-fluid-change-tools-parts-and-links.123850370/page-8#post-6745047