Help guys!

the lights from the bottom deck stays on, its the whole deck thats under the navi controls and above the flip up compartments. few days ago it didnt turn on at all, but it randomly started working again. it does behave differently now tho, when the cars on it behaves normally, when the cars off the button lights stays fully on.

my car is a TL-S 07'. i recently had an alarm and amp put in. alarm includes remote start. also, locs and and amp was put in after the stock amplifier.

is there something i can check? or should i really just give it to the dealer?