Yeah the east wing is notorious for that cold spot, been documented loads of times by different groups over the years. Some people put it down to drafts from the damaged sections of the building but honestly the temperature drops too sharply and too localised for that explanation to hold up.
Was you using a thermometer or just going by feel? Makes a difference to how seriously people take the report tbh. I've been to a few places in the UK where similar cold zones turned out to correlate with where patients died in high numbers and Waverly Hills obviously has no shortage of those areas.
Would be interesting to know if anyone else in your group felt it or if it was just you. Sometimes one person picks up on something the others completely miss, which in itself is worth noting down.