Lubricant issue
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What causes bubbles in the lubricating oil inside the centrifugal pump bearing housing?
If there are bubbles, it means the oil has become emulsified and degraded. To fix this, the oil must be changed thoroughly: drain the old oil, clean the bearing housing with diesel, then pour in new oil and replace it twice, filling it to between one-half and two-thirds of its capacity
What the guy upstairs said makes sense – when oil is exposed directly to light for a long time, it can become emulsified and deteriorated, and bubbles may form. At the same time, bubbles may also form if there is moisture and impurities in the oil.
That makes sense, but is it possible that the oil level setting is too high?
The quality of the oil, its moisture content, level of contamination, and degree of emulsification were not checked