One problem related to transmission pump has been reported for the 2004 Volkswagen Beetle. The most recently reported issues are listed below.
1) inferior automatic transmission pump valve assembly caused very hard down and up shifting that could startle the driver. It was replaced at owner's expense. 2) left side rear window regulator failed and was replaced at time of purchase (Feb. 2012). Right side rear window regulator has failed July 2012 and must be replaced at owner's expense.