What was found
AT APPROX FL 350 CABIN ALTITUDE WARNING HORN ILLUMINATED. COMPLIED WITH QRC/QRH. CABIN ALTITUDE EXCEDED 10000 FEET. WAS ABLE TO REGAIN CONTROL OF CABIN ALT.CABIN ALT WARNING HORN EXTINGUISHED AT APPROX. FL 270 / CHECKED BOTH CPC CONTROLLERS PER AMM 21-31-00 NO FAULTS FOUND. TESTED BOTH CABIN ALTITUDE SWITCHES PER AMM 21-33-00. #2 CABIN ALTITUDE SWITCH FAILED THE TESTR/R'D #1 & #2 CABIN ALTITUDE SWITCHES PER AMM 21-33-04. OPS CHECK GOOD#1 ON ON 214C50-2 SN ON BN 117529 PN OFF 214C50-2 SN OFF AA10341A#2 ON ON/OFF 214C50-2 SN ON BN117529 SN OFF N018249A