Very strange. As Bob said there are no temperature sensors. The valve is not a temperature controlled valve. It is a pressure balancing valve. It controls temperature by keeping the hot and cold water pressures balanced. As different people use more or less water, the water pressure changes. Try taking a shower at 3 AM and you probably won't have a problem.
Maintenance personnel sometimes know what they are doing. Sometimes they don't. If they said they replaced the temperature sensors, that makes me suspicious. Here is a break down of the valve and a trouble shooting guide. The spindle (TA-10) probably should be replaced. Maybe maintenance replaced it, maybe not. You can't tell from what you were told. If they replace it, I would think they would have said "We replaced the spindle", not "We replace the temperature sensors."
Not a really difficult problem to solve.
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