Sidewinder Problem Question

I have an old sidewinder laying around that i want to put in a scale crawler soon. I regrettedly let my mate borrow it cause he was having problems with his esc, & somehow he's manage to stuff it. Im getting all three LEDs flashing upon battery insertion (i dont use the on/off switch). Im certain the problem is internal cause i triple checked the rx was plugged in right, checked the board for any defects & also went over the wires. Im thinking of getting a CCBEC for it later, could this problem be due to an internal BEC issue?

Id like to try & fix it myself, I live in australia so i gotta send it away to get repaired & itd take a while...