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Since you have already replaced the Frt LG Hydac valve with new one you did verify the manual override screw on new Hydac valve is fully CCW? If it isn’t then when you operate slide switch to move hydraulic slides fluid will pass thru the LG lines ( front are tandem connected)
If that’s good then have you verified that when you operate slide out switch that LG Hydac valve is nit picking up a 12 volt DC signal and opening inadvertently?
Color code from front control module to that Frt LG Hydac valve is GRAY wire.. there should be no 12 volt reading on this wire when the hydraulic slide outs are moving..
See image for my pin out of OEM wire harness and color codes.. image from my fifth wheel
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