What was found
AFTER TAKEOFF HUD DISPLAYED "TAILSTRIKE" AND DISPLAYED "PWS FAIL" BOTH DISPLAYED AT THE SAME TIME AND CLEARED THEMSELVES AT THE SAME TIME DURING CLIMB. GROUNDED - YES. PERFORMED WEATHER RADAR (WXR) SYSTEM OPERATIONAL TEST IAW B737-800 AMM 34-43-00-710-002-001, NO FAULTS FOUND. ACCOMPLISHED GRD PROX WARN SYS OPS TEST, NO FAULTS REF AMM 34-36-00-710-804-002. ACCOMPLISHED HGS SYS TEST, SENSORS DATA TEST, CDS/GPWS DATA, NO INACTIVE FAULTS AND ALL OTHER WARN WAS NORMAL. HGS SYS TEST, OPS NML REF AMM 34-36-00/500.