Resolved Question: rats or hot water heater noises? puzzled.?

In a mobile home, I hear clicking, ticking noises by the bathroom and bedroom vents-they are adjacent to each other. I had a bad problem with rats-pest control came out for 2 months-caught 2. They had chewed up water lines and the over flow pressure tube from the hot water heater. I had the ducts/vents cleaned out by professionals, in case, some mice were making the noise I still hear by the vents-usually at 9 to 10am and 8-9pm at nite or so. I still hear the tick, tick noise. I had a

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