Took my 2006 Lexus RX400h in for routine 75000 mile service. It was driving fine, no problems. They tell me I have a coolant leak and need to replace my transmission for $9000 parts and labor. Here is what they say is wrong: "Need to replace transmission due to coolant leaking from between transmission cases. The gasket sealant is separating from transmission case. Parts cost for all parts needed-$7187.59 (includes transmission, any and all bolts or gaskets needed and transmission fluid) Labor to replace transmission-$1910.00" It sounds like they need to remove the transmission just to reach the problem area? I found a similar problem described online. Is this a manufacturing/engineering defect? Do I really need to get a new transmission?

Took mine in for the recall on the invertor power supply and 2 weeks later I magically have a "transmission coolant leak that the seal cant be repaired and I need a new transmission to the tune of about $7,ooo

Transmission going faulty and coolant leaking from its gaskets.This problem indicates towards faulty/ cracked inverter coolant reservoir .But i suggest first get the transmission inspected by the proper transmission shop.Transmission getting faulty, with vehicle driving fine , is bit rare.---------- The coolant leaking from inverter reservoir, is very much noticed in Lexus RX vehicles.------ ----------- The inverter is not repairable and is replaced as an entire unit.It is also costly part, approx $7000 including labor.But suddenly this problem showing up is rare.-------- You need to get it reinspected at any other proper shop, and get exact confirmation.---------- The inverter is the black rectangular thing with the rectangular warning sticker on it. The black plastic stealth bomber shaped thing on top of that is NOT part of the inverter. If you remove the engine cover on the driver's side of the engine, the inverter is the whole unit under that (with the plastic coolant reservoir on top) and it sits on top of the ******.----------- Getting both transmission and inverter reservoir inspected is advisable.------------ Thanks.Helpmech.