A four-day slump in Netflix Inc. after disappointing second-quarter earnings has pushed the shares below one key support level and left them testing a second. Netflix fell as low as $344 on Tuesday after the streaming-video company\u2019s forecast for subscriber growth trailed analysts\u2019 estimates. That was a hair\u2019s breadth from their 100-day moving average, a level they\u2019ve mostly remained above for the better part of two years. The stock swung between gains and losses Friday but never broke above the 50-day moving average, which has been a support level throughout the on-again, off-again market rebound from this year\u2019s correction. It closed below that line Thursday for the first time since April. Netflix, which touched a record high of $423.21 in late June, has fallen 8.5 percent this week and is on track for its biggest weekly decline in two years. The shares were selling for $362.49 in Friday afternoon trading.