What was found
LANDING GEAR RETRACTION INOP-(NLG DID NOT RETRACT). PUT A/C ON JACKS IAW CRJ 200 AMM 07-11-01-582-801. REMOVED AIRCRAFT FROM JACKS IAW CRJ 200 AMM 07-11-01-582-8004. CLEARED PSEU MEMORY THEN ATTEMPTED GEAR SWING, INTERROGATEN PSEU MEMORY AND FOUND S23 FAR. CHECKED GAP OF PS14GA, NLG CENTERED/EXTENDED PROX SENSOR AND FOUND TO EXCEED LIMITS. ADJUSTED NLG CENTERED/EXTENDED PROX SENSOR PS14GA IAW CRJ 200 AMM 32-61-05-820-801 STEP 3E, PSEU POWER-UP CKS OK IAW AMM 32-61-00-740-801, PERFORMED LANDING GEAR EXTENSION AND RETRACTION IAW CRJ 200 AMM 32-30-00-710-802 ALL OPS AND IND OK.