when I shut the front air off I notice hot spot over clean out hole drawing air & it looks like only the right side of air washers are blowing. Ran a probe up left rear air intake but found no vertical blockage. Smoke test shows left intake is drawing, but maybe not as much as right. I take this stove apart & clean good at least 3 times year + sweep chimney. Not neglected. clean out brick still fits well, not broke. Watcha thinks?