Get the temps correct and measured with digital temp gun or thermometer.
Once you get that spot on youll know how and where to fix it.
DO NOT feed for 2 weeks to allow the stomach acids to rebuild up. If fed too soon youll only produce another regurge.
At 2 weeks from the regurgitation offer a fuzzy mouse. If it stays down great, in 14 days again offer a fuzzy mouse. If second meal stays down then in 7 days offer fuzzy mouse. TAKE IT SLOW WITH SMALL MEALS. Rushing it will only cause the snake to be prone to regurgitation's as it ages.