Installed a used transaxle in 89 Camry. Checked before removal from another car. Drove for several weeks - worked excellently. Then, one morning could not shift from park until pushing the manual button on the console. While driving, Low range and reverse work fine, but drive mode is slush. Checked hydraulic pressure and throttle adjustment. Question: Are the two related? Could this be a transmission problem, or part of the controls regulating the transmission?