Final answer:
The correct response requires consulting Viktor Frankl's own accounts, particularly his book 'Man's Search for Meaning.' Without this source, the answer to what additional service the Capo did for Frankl cannot be provided accurately.
Step-by-step explanation:
The question refers to Viktor Frankl, an Austrian neurologist, and psychiatrist as well as a Holocaust survivor, which suggests a historical and biographical context. The additional service that the Capo did for Frankl is not detailed in the reference information provided, and since this is a specific detail from Frankl's life and experiences, it is crucial to consult Frankl's own accounts, specifically his book 'Man's Search for Meaning,' to find the correct answer.
If this service is indeed mentioned in his works, the appropriate source would need to be cited to provide a factual response. Without the correct information at hand, I must refuse to answer this question to maintain accuracy and integrity.