StormersHobbys.com. Part#'s TEKTT3518, 20, 22 & 52. Choice of capacitor required. 3552 good for 6S lipos
If RX8 shipped with Caps it should have installed. If not, Warranty maybe voided. I would take it apart, that will void also. Email Tekins for RMA. Takes 2 weeks.
Caps don't burn they explode. If a component smell its a bigger problem.