You have to be pretty dedicated, or have good resources, to repair some of the common ills of this orphan, which include:
* LDU internal coolant leak (which ruins inverter board/harness eventually if left unaddressed). Resealing (seal replacement) has not been a long-term fix for the LDUs on Model S, so "coolant delete" manifolds have been installed on recent Tesla LDU rebuilds -- from Tesla!! -- and an aftermarket one is being marketed by QCC, but no field reports are available yet.
* OBC failure (sometimes requires only fuses replacement, sometimes have to replace entire unit with one from an early Model S and swap control board with old one, or reflash the Model S' using TPD. ~12 hours labor to access fuses). Parts cost is relatively cheap but labor is relatively high, unless you DIY.
* Cabin heater failure (replace with an early Leaf (etc.) heater and minor wire splicing; often also requires a fuse replacement inside the DC-DC Converter, which has a glued-on cover, but is easy to R&R otherwise; all parts are right up on top so easy access and little labor involved)
* HV Battery contactor(s) failure (requires removing the ~900 lb HV battery to access the contactors, which is best accomplished using a car lift, but can be done on a flat surface with lots of fiddling. Removing/reinstalling the battery case's lid is not for the faint of heart, and is best removed using a special-order multimaster bit on a oscillating tool (see
this YT vid for more info)(I own the original Fein Multimaster, and have recently acquired the special bit). This is probably one of the most challenging repair jobs, due to the labor to R&R the battery, and to R&R the cover, which is fairly fragile and has to be re-used.
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On my '14, the
LDU was replaced for noise in 2018 and is probably due for a Coolant Delete upgrade soon. My OBC was replaced under warranty before 2017, and
I replaced the fuses due to one failed, in Apr2023. The Cabin Heater & DC-DC was
replaced under warranty in 2019, but I'd repair them myself if they fail again. And, my HV battery assy. was
replaced in 2019 under warranty due to a stuck contactor a couple of years ago.