What was found
CLIMBING OUT OF 24000 FEET F/A REPORTED A STRONG SMELL IN THE CABIN AS WELL AS PAX'S, STARTED TO RETURN TO DFW, SMELL AND BURNING SENSATION IN EYES AND THROAT. O2 MASK ON. TRANSFERRED TO NRWC 059-DFW-00050. REMOVED AND REPLACED R/H ACM IAW EMB 175 AMM 21-51-05 AND REMOVED AND REPLACED R/H DUAL HEAT EXCHANGER IAW EMB 175 AMM 21-51-04. C/W ADJUSTMENT AND TEST OF LH ACM.IAW EMB MM CH 21-51-05.ALL CHECKS W/I LIMITS . NO DEFECTS AT THIS TIME. ACCOMPLISHED DUEL HEAT EXCHANGER ADJUSTMENT/TEST IAW EMB 175 AMM 21-51-04 OPS CHECK NORMAL LEAK AND OPS CHECKS GOOD. REMOVED AND REPLACED R/H DUAL HEAT EXCHANGER IAW EMB 175 AMM 21-51-04. ACCOMPLISHED RH DUEL HEAT EXCHANGER LEAK CHECK IAW EMB 175 AMM 21-51-00 NO LEAKS NOTED.