What was found
TEMP GAUGE IN CONTROL SETTING READS 100 DEGREES C. TAPPING THE SELECTOR CHANGES THE READING TO VARIOUS READINGS 40C, 60C. ACTUAL TEMP IS NORMAL. ACFT GROUNDED. CONFIRMED FAULT, TEMPERATURE GAUGE POINTER FLUCTUATES WHEN TEMP SELECTOR SWITCH MOVED. FOUND CABIN TEMP SELECTOR SWITCH NOT SECURED AND LOOSE, SECURED AND ACCOMPLISHED CABIN TEMPERATURE SELECTOR TEST IAW AMM TASK 21-61-07-840-006-002, OPS CHECKED NORMAL.