Actually the tumbler. Usually gives some warning signs before it failes. If if fails it locks itself in. If you replace it before it fails its about $70 (including a $25 key). If you replace it after it fails it can cost 10 (ten) times as much

Thermostat cover: it has been upgraded to a metal one. If its plastic, change it and the thermostat (good preventive maintance).

For engine stuff refer to its model number: M103. There are a lot more M103's than 190e's.

And where did you find the dope?

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)