Vin# 2hkl18654h500242 not sure if LX or EX

Vin# 2hkl18654h500242 not sure if LX or EX. My wife's car began having funky electrical problems this summer. The driver side window will sometimes work or not. The rear temp control stopped blowing air when the window was not working and works when the drivers side window works.
This summer a Honda tech replaced both rear center rollers, after that, at that time both doors worked. The tech also confirmed that the left front window and rear blower was inoperable and diagnosed and found faulty passenger side multiplex, but told us this is the first step and may need more.
Later on the drivers side sliding door began to sometimes not respond to controls- at first it was the door handle, it would close but not all the way unless we pushed the button on the dash to close it, now neither works. The latest thing is now when the car is left locked, turned off, with no one around the alarm will go off - until turned off with the remote key fob. Also the car will lock it self all doors except the hatch.
If it is the passenger side multiplex is this something a novice could replace and how?