TRC off... maybe u pressed a button or something something that switched your traction control off. If so, just press it again when ur done drifting like one guy said...
If VSC always on... dunno, maybe u screwed the Vehicle Stability Control and it needs checking...
Wonder if any Z owners had encountered any brake problem with the loose/metal sound when you stepped on the brake at low speed (between 10-30kmph). While riding below 20kmph, the SLIP light would turn on for seconds...