Working on a km-3050, when the customer received the unit i showed them how to print labels and envelopes. Now the envelopes dont print properly. The address in the corner of the envelope only prints half and i get a black line on the envelope. If i put an 8.5 x 11 sheet of paper and print as if it were an envelope the address comes out fine. I have checked all the rollers, they are all fine. Swapped out parts with another km-3050. Still same outcome. Any ideas would be appreciated as to i am at my wits end with this unit(AAAAARRRRGGGGGHHHHHH).

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