Many have speculated on the location of the yellow dining room. It was generally thought to be #161 on the 2nd floor, part of the 3rd Spare.
The Crimson drawing room #159 was next to the dining room and sustained parquet damage.
The guardroom #26 was under #160. It appears a small area on the plans. Mezzanines were constructed over #26 resulting in large number of guards stationed there (11 killed, 56 wounded on Feb 5th, 1880).