MANAMA, Bahrain - Red Bull's troubles seemed to have carried over from Jerez, as driver Sebastian Vettel struggled to get up to speed here for the second round of Formula 1 testing in the troubled RB10.It's two weeks since the Jerez calamity in January 2014 and the reigning World champion team is back on track with fixes by designer Adrian Newey and Renault in place but four hours into the first day of the second official pre-season test Vettel had not turned a lap.'CAR IS BEING ASSEMBLED'F1 correspondent Michael Schmidt told Auto Motor und Sport: "The car was still being assembled. New parts were still arriving from England."It is becoming clearer that many of Red Bull's problems are not engine supplier Renault's fault. On Wednesday (February 19) Renault-powered teams, among them Caterham and Lotus, were busy collecting laps.The first public glimpse of the unique double-nosed 2014 Lotus, which also has an asymmetrically positioned exhaust, can be seen here. Renault Sport's Remi Taffin said: "I'm not saying that we've solved all of our problems but we should have a firm grip on what held us back at Jerez. We now have a base on which to build. Bahrain is our first test."Even Red Bull's always blunt Helmut Marko was not pointing the finger of blame at Renault. "Even if there were no problems with the power unit we would not have been running much in Jerez."It was our fault. Under the cover it was getting too hot, so we've brought two solutions to Bahrain."At about 2pm Bahrain time Vettel emerged from the pits for an installation lap and soon followed it up with an initial run of four laps. Meanwhile, a photo of former Lotus boss Eric Boullier in McLaren grey in Bahrain can be seen here.