This short stretch of wall could be the same wall as 5545. Its western side also formed the limit of the opening/entrance between room 19 and the Northern area (of drains/orthostate wall/bedrock terrace) which 5749 now fills.
Ashlar wall running E-W at western limit of area (5686), Short stretch of tufo ashlar wall at west end of 5545 (5748), Packing of small stones and tiles between 5686 and 5748 (5749), and construction trench fill to north (5681)