Was the mitzvah of הטבת הנרות - preparation of the wicks of the Menorah incumbent solely on the Kohen Gadol or was it done by all kohanim?
The Midrash Tanchuma says that after witnessing the tribe leaders offerings, Aharon Hakohen became sad, because he nor his tribe was included in the procession. G-d comforts Aharon by giving the directive of the Menorah.
However, the Rambam rules (Bias Mikdash 9:7) that even a non-kohen may light the menorah (assuming it was brought out of the temple and brought out to the temple courtyard).
Rav Chaim Soloveitchik explains that the Rambam understood the that the mitzvah of Menorah is not that a Kohen must light the Menorah, but rather that it should be lit. The only thing incumbent on a kohen is the preparation of the wicks, but not the lighting. Thus even a non kohen may light the menorah.
However this law of הטבת הנרות is it done by even a Kohen Hedyot (a regular kohen) or must it only be done by the Kohen Gadol?