So we know that when we get the white "Visit Workshop" message and we discover it's related to the the SBC, it's due to one of the following:

C249F Operating time of a7/3 (hydraulic unit) is exceeded
C2131 Pressure Reservoir faulty
C235C or C235A Service threshold reached

If it's the C249F or C235, it sounds like it's around 600k actuations for the later (or updated) SBC units....although there's no exact number because other factors are apparently taken into account.

Am I correct that, if one lets things go and sees the dreaded red message of death, it's not because some new count threshold has been reach but rather because there has been actual mechanical failure? In other words, it can't possibly be that the red message would appear if the unit were still mechanically functional, right?

Also, anyone want to hazard a guess as to how much margin of safety MB engineers built in between the white message and the red message? If one were away on long trip, would it be reasonable to conclude that it's safe to drive home several hundred miles without worrying about failure?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife