I got that same problem with both line in jacks. Like they got a short or something and I gotta keep moving them around to get the signal. I don't know if I should replace them or what. I need some advice too
I feel like Diamond D, the best producer on the mic...
I can't remember if the record input connectors are sealed or open.
If they are open, usually the connectors just need to be pushed inward to make contact with the 1/4" jack (I sometimes have this problem with my TR-808 outputs). If they are sealed, then I might just be a loose wire.
Soldering is easy just as long you don't use too much solder and have it drip onto another electrical component.
Good Luck.............