# Service bulletin SB\-77

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11023313
- Published by NHTSA: 2025\-09\-23
- Manufacturer's number: SB\-77
- Manufacturer's date: 2025\-09\-22
- Campaign id or software version: SB\-77
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

TriMark brought to Tiffin’s attention that on certain 2025 and 2026 Allegro Breeze; 2025 and 2026 Allegro Bus; 2025 and 2026 Allegro RED 360; 2025 and 2026 Byway; 2025 and 2026 Phaeton; 2025 and 2026 Zephyr Motorhomes that are equipped with PTL entry doors with a TriMark entry lock, owners may experience a lock out situation. TriMark has notified Tiffin Motorhomes that there is a possible condition where the exterior entrance door handle mechanism can bypass the inside linkage causing a lock\-out situation whereby the door cannot be opened from the exterior handle. TriMark is replacing all involved entry door inside handle assemblies with new inside handle assembles. PTL Engineering states these locks are installed in entry doors with a serial number \#068849 through \#072552.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11023313-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11023313-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Vehicles listed

- 2025 TIFFIN ALLEGRO BREEZE
- 2025 TIFFIN ALLEGRO BUS
- 2025 TIFFIN BYWAY
- 2025 TIFFIN PHAETON
- 2025 TIFFIN ZEPHYR

JSON: [/v1/bulletins/11023313](/v1/bulletins/11023313)

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