新手請教兩個遠程房屋維護問題

新手小房東，去年人生第一次買了一個異地小投資房， 是新房，當時沒做inspection. 現在快一年了，最近做了個inspection, 沒發現啥問題，就是看到主臥的celling 跟牆交界的地方有一點不平。

房子隻有一層，驗房師說看不到牆裏麵， 不知道是不是結構問題。

“Drywall ceilings with LVP flooring installed. There was a big dip in the master bedroom ceiling. The condition of
floor coverings is not commented on unless there is a structural significance."

“I'm curious about that dip in the ceiling. I'm not sure what caused that, it could have been a construction or but I just really can't see. I would definitely ask him about that. Want to make sure the truss is installed properly. That is tge framing that supports the roof and ceiling. ”

因為還在一年保修期內，聯係建商來看。 建商說不是結構問題，是個氣泡

"Inspection Complete and found that the actual issue is a small bubble that is worthy wall and the ceiling meat and the owners bedroom. It is not structural it is not a low being the slight bubble in the drywall texture is right about 1/4 of an inch with intolerance. "

想請教幾個問題：

1.這個氣泡問題大嗎？ - 附圖

2.建商說可以來修，但需要房客把臥室騰空。我讓房客問修的話需要多久，1天之內還是幾天， 還沒收到回音。

這種給房客造成的不便， 我需要做什麽嗎？ 或者給什麽補償嗎尤其如果一天修不完的話？

房客是一家四口，非常好的房客，每月房租都提前1-3天交，房子也很愛惜，保持的很好。簽的是兩年的合同。之後估計還會續約。

3.新房的fence 去年裝好後好像沒有刷保護層。 現在還沒問題因為剛一年。 驗房師建議考慮刷一層保護。這個現在就刷還是等幾年再刷？ 我問了一個價大概$900.

新手沒經驗，多謝各位！