I confirmed that I have a solid 23 Hg of vacuum from the pump, so that's good. However, while driving I also noticed that the braking power seemed to be a bit reduced from what I'm used to.

My understanding is a leak downstream from the accessories port coming out of the pump would not affect the braking. Does it sound likely that my problem is on the brake booster side of things? If there's a leak in the booster, will that also manifest itself in symptoms other than braking?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife