This increase seems to start after klog#22470 on Oct 13th (Fig.1). Because much H2O can go to the IX/IY area from the MICH area, we can expect some amount of temp increase.
In the IX area, the temps of, at least, the 4K-ref*-50K-bar/head and arm/BS-side-radiation shield are increasing in the same manner (Fig2).
The IY area shows the same temp enhancement around Oct 13th. However, after that, the temps are roughly constant for the 4K-ref*-50K-bar/head and "BS-side-radiation shield". While finally?, the temp of the arm-side-radiation shield seemed to slightly increase(Fig3).
The IXA pressure level might show a trend change?
It keeps decreasing.
IXA vacuum level once became ~5x10^-3 Pa and ~5x10^-5 Pa level around 9 am on 10th Dec. The temps of the duct shield are around 200~190K
We can open GVs, maybe.