What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: pilot advised after departing sch and climbing thru 7000 ft., he heard a "popping" sound and observed smoke in cockpit. He advised ATC but did not declare an emergency. Returned to sch and landed without incident. Maintenance investigation revealed a shorted and burnt resistor in the heater circuit which fell out from under panel and slightly burnt cockpit rug. FAA form 8010-4 issued. This matter is closed.
As the FAA filed it
NARRATIVE: PILOT ADVISED AFTER DEPARTING SCH AND CLIMBING THRU 7000 FT., HE HEARD A "POPPING" SOUND AND OBSERVED SMOKE IN COCKPIT. HE ADVISED ATC BUT DID NOT DECLARE AN EMERGENCY. RETURNED TO SCH AND LANDED WITHOUT INCIDENT. MAINTENANCE INVESTIGATION REVEALED A SHORTED AND BURNT RESISTOR IN THE HEATER CIRCUIT WHICH FELL OUT FROM UNDER PANEL AND SLIGHTLY BURNT COCKPIT RUG. FAA FORM 8010-4 ISSUED. THIS MATTER IS CLOSED.