What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) N71MJ, a PA-31 was on a day VFR pleasure flight with a pilot and two passengers on board. The pilot had been previously conducting practice takeoffs and landing. While taxiing to return to the runway, the pilot cycled the landig gear switch from the down neutral position to the down position. Verbal and written statements from the pilot indicated that the landing gear selector switch was pulled out and then pushed down. When this action occurred the left main landing gear collapsed with the left wing and propeller impacted the ground. Investigation revealed that the landing gear anti-retraction solenoid had previously been improperly installed, and was not correctly aligned, allowing the landing gear selector switch to be moved past the down detent.
As the FAA filed it
(-23) N71MJ, A PA-31 WAS ON A DAY VFR PLEASURE FLIGHT WITH A PILOT AND TWO PASSENGERS ON BOARD. THE PILOT HAD BEEN PREVIOUSLY CONDUCTING PRACTICE TAKEOFFS AND LANDING. WHILE TAXIING TO RETURN TO THE RUNWAY, THE PILOT CYCLED THE LANDIG GEAR SWITCH FROM THE DOWN NEUTRAL POSITION TO THE DOWN POSITION. VERBAL AND WRITTEN STATEMENTS FROM THE PILOT INDICATED THAT THE LANDING GEAR SELECTOR SWITCH WAS PULLED OUT AND THEN PUSHED DOWN. WHEN THIS ACTION OCCURRED THE LEFT MAIN LANDING GEAR COLLAPSED WITH THE LEFT WING AND PROPELLER IMPACTED THE GROUND. INVESTIGATION REVEALED THAT THE LANDING GEAR ANTI-RETRACTION SOLENOID HAD PREVIOUSLY BEEN IMPROPERLY INSTALLED, AND WAS NOT CORRECTLY ALIGNED, ALLOWING THE LANDING GEAR SELECTOR SWITCH TO BE MOVED PAST THE DOWN DETENT.