gab_au:
No no. The SYTF assembly is a combination YTF and SPDT switch. If the switch is in the low-band position, signal goes in the input port, and out the low-band output port. If the switch is in the high-band position, signal goes in the input port, through a YTF, and then out the high-band output port. It is the low-band signal path that I see 30 dB of attenuation on. The high-band port I have not yet checked, as I don't have a high enough frequency VNA.
MarkL: Ahhh nice catch! Yeah. I didn't know that there was still a lower position you could place the attenuator in. Indeed the value shown under "ATTEN" matched the attenuation of the attenuator assembly, as verified by a VNA. So this part is fine.